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\newcommand{\titre}{Le car de ramassage}
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    \small Un car de ramassage doit s'arrêter à chaque carrefour d'un quartier, une fois et une seule. Selon le plan c'est possible ou non — et un simple coloriage permet souvent de le dire d'avance, sans essayer.
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\end{center}
\noindent \textbf{Le car part de l'école, au carrefour M, et doit s'arrêter à chaque carrefour exactement une fois.} Il emprunte les rues qu'il veut et n'a pas à toutes les parcourir.\par\addvspace{0.35em}
\begin{center}
\renewcommand{\arraystretch}{1.35}
\begin{tabular}{|c|c|c|c|}
\hline
\cellcolor{black!32}\bfseries Les rues & ⑩ venelle du Chat & Ⓑ Place Sainte-Croix & Ⓛ Placette des Ormes \\ \hline
① rue Pasteur & ⑪ quai aux Fleurs & Ⓒ Carrefour Saint-Roch & Ⓜ Place du Vieux-Puits \\ \hline
② impasse des Roses & ⑫ impasse des Cerisiers & Ⓓ Carrefour du Lavoir & \cellcolor{black!32}\bfseries Les bâtiments \\ \hline
③ rue Haute & ⑬ rue des Jardins & Ⓔ Rond-point de la Gare & \textbf{a} l'école \\ \hline
④ rue Neuve & ⑭ rue de l'Église & Ⓕ Carrefour de la Mairie & \textbf{b} le stade \\ \hline
⑤ rue des Lilas & ⑮ rue du Four & Ⓖ Carrefour de l'Hôpital & \textbf{c} la mairie \\ \hline
⑥ rue de la Poste & ⑯ avenue de la Gare & Ⓗ Fontaine Notre-Dame & \textbf{d} le cimetière \\ \hline
⑦ rue du Moulin & ⑰ sentier des Prés & Ⓘ Rond-point de la Poste &  \\ \hline
⑧ passage du Marché & \cellcolor{black!32}\bfseries Les carrefours & Ⓙ Carrefour des Tilleuls &  \\ \hline
⑨ boulevard du Parc & Ⓐ Place de l'Église & Ⓚ Rond-point du Stade &  \\ \hline
\end{tabular}
\end{center}
\noindent{\small\itshape Légende du plan}\par\addvspace{0.4em}
\begin{enumerate}
  \item Colorier les carrefours du plan avec \textbf{deux couleurs}, de sorte que deux carrefours \textbf{reliés par une rue} ne soient jamais de la même couleur. Combien y en a-t-il de chaque couleur ?
  \item Le car roule d'un carrefour au suivant. Que peut-on dire de la \textbf{couleur} des arrêts successifs ? Qu'en déduire sur les couleurs des arrêts d'une tournée qui les dessert tous ?
  \item \textbf{Le car peut-il desservir tous les carrefours, une fois chacun, et revenir à l'école ?} Si oui, décrire un trajet ; sinon, démontrer que c'est impossible.
  \item \textbf{Et s'il n'est pas obligé de revenir à l'école ?} Même consigne.
\end{enumerate}
\newpage
\section*{\textcolor{red}{Correction}}
\needspace{5\baselineskip}
\subsection*{\textcolor{red}{Le car de ramassage — Correction}}
\needspace{3\baselineskip}
\begin{center}
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\draw[line width=0.5pt] (1.358,5.422) -- (1.636,5.433) -- (1.916,5.437) -- (2.195,5.435) -- (2.474,5.426) -- (2.753,5.41) -- (3.031,5.388) -- (3.309,5.359) -- (3.586,5.324) -- (3.863,5.282) -- (4.138,5.234) -- (4.412,5.18) -- (4.684,5.118) -- (4.955,5.051) -- (5.224,4.977);
\draw[line width=0.5pt] (8.315,5.204) -- (8.471,5.138) -- (8.628,5.075) -- (8.786,5.016) -- (8.946,4.96) -- (9.107,4.908) -- (9.27,4.86) -- (9.433,4.816) -- (9.597,4.776) -- (9.763,4.74) -- (9.929,4.707) -- (10.096,4.679) -- (10.263,4.654) -- (10.431,4.633) -- (10.599,4.617);
\draw[line width=0.5pt] (8.315,5.204) -- (8.306,4.939) -- (8.291,4.674) -- (8.269,4.409) -- (8.241,4.145) -- (8.206,3.881) -- (8.166,3.619) -- (8.119,3.357) -- (8.067,3.096) -- (8.008,2.837) -- (7.943,2.58) -- (7.872,2.324) -- (7.795,2.069) -- (7.712,1.817) -- (7.624,1.567);
\draw[line width=0.5pt] (5.224,4.977) -- (5.446,4.959) -- (5.668,4.947) -- (5.89,4.94) -- (6.112,4.938) -- (6.335,4.941) -- (6.557,4.949) -- (6.779,4.963) -- (7.001,4.982) -- (7.222,5.006) -- (7.442,5.035) -- (7.662,5.07) -- (7.881,5.11) -- (8.099,5.154) -- (8.315,5.204);
\draw[line width=0.5pt] (10.599,4.617) -- (10.656,4.438) -- (10.708,4.258) -- (10.755,4.077) -- (10.799,3.895) -- (10.838,3.712) -- (10.873,3.528) -- (10.904,3.343) -- (10.93,3.157) -- (10.952,2.971) -- (10.969,2.785) -- (10.983,2.598) -- (10.991,2.411) -- (10.996,2.223) -- (10.995,2.036);
\draw[line width=0.5pt] (7.624,1.567) -- (7.868,1.563) -- (8.112,1.565) -- (8.356,1.573) -- (8.6,1.587) -- (8.843,1.606) -- (9.086,1.632) -- (9.329,1.662) -- (9.571,1.699) -- (9.811,1.741) -- (10.051,1.789) -- (10.289,1.842) -- (10.526,1.901) -- (10.762,1.966) -- (10.995,2.036);
\filldraw[fill=black!38, draw=black, line width=0.5pt] (11.165,11.567) -- (11.137,11.71) -- (11.056,11.831) -- (10.935,11.912) -- (10.792,11.94) -- (10.649,11.912) -- (10.528,11.831) -- (10.447,11.71) -- (10.419,11.567) -- (10.447,11.424) -- (10.528,11.303) -- (10.649,11.222) -- (10.792,11.194) -- (10.935,11.222) -- (11.056,11.303) -- (11.137,11.424) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (2.475,11.243) -- (2.447,11.386) -- (2.366,11.507) -- (2.245,11.588) -- (2.102,11.616) -- (1.959,11.588) -- (1.838,11.507) -- (1.757,11.386) -- (1.729,11.243) -- (1.757,11.1) -- (1.838,10.979) -- (1.959,10.898) -- (2.102,10.87) -- (2.245,10.898) -- (2.366,10.979) -- (2.447,11.1) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (7.792,10.8) -- (7.764,10.943) -- (7.683,11.064) -- (7.562,11.145) -- (7.419,11.173) -- (7.276,11.145) -- (7.155,11.064) -- (7.074,10.943) -- (7.046,10.8) -- (7.074,10.657) -- (7.155,10.536) -- (7.276,10.455) -- (7.419,10.427) -- (7.562,10.455) -- (7.683,10.536) -- (7.764,10.657) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (4.798,10.737) -- (4.77,10.88) -- (4.689,11.001) -- (4.568,11.082) -- (4.425,11.111) -- (4.282,11.082) -- (4.161,11.001) -- (4.08,10.88) -- (4.052,10.737) -- (4.08,10.595) -- (4.161,10.474) -- (4.282,10.393) -- (4.425,10.364) -- (4.568,10.393) -- (4.689,10.474) -- (4.77,10.595) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (11.077,8.536) -- (11.049,8.678) -- (10.968,8.8) -- (10.847,8.88) -- (10.704,8.909) -- (10.561,8.88) -- (10.44,8.8) -- (10.359,8.678) -- (10.331,8.536) -- (10.359,8.393) -- (10.44,8.272) -- (10.561,8.191) -- (10.704,8.162) -- (10.847,8.191) -- (10.968,8.272) -- (11.049,8.393) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (4.8,8.448) -- (4.771,8.59) -- (4.69,8.712) -- (4.569,8.792) -- (4.426,8.821) -- (4.284,8.792) -- (4.163,8.712) -- (4.082,8.59) -- (4.053,8.448) -- (4.082,8.305) -- (4.163,8.184) -- (4.284,8.103) -- (4.426,8.074) -- (4.569,8.103) -- (4.69,8.184) -- (4.771,8.305) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (8.008,8.085) -- (7.979,8.228) -- (7.899,8.349) -- (7.777,8.43) -- (7.635,8.459) -- (7.492,8.43) -- (7.371,8.349) -- (7.29,8.228) -- (7.261,8.085) -- (7.29,7.942) -- (7.371,7.821) -- (7.492,7.741) -- (7.635,7.712) -- (7.777,7.741) -- (7.899,7.821) -- (7.979,7.942) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (1.731,5.422) -- (1.702,5.565) -- (1.622,5.686) -- (1.5,5.767) -- (1.358,5.796) -- (1.215,5.767) -- (1.094,5.686) -- (1.013,5.565) -- (0.984,5.422) -- (1.013,5.28) -- (1.094,5.159) -- (1.215,5.078) -- (1.358,5.049) -- (1.5,5.078) -- (1.622,5.159) -- (1.702,5.28) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (8.688,5.204) -- (8.66,5.347) -- (8.579,5.468) -- (8.458,5.549) -- (8.315,5.578) -- (8.172,5.549) -- (8.051,5.468) -- (7.97,5.347) -- (7.942,5.204) -- (7.97,5.061) -- (8.051,4.94) -- (8.172,4.859) -- (8.315,4.831) -- (8.458,4.859) -- (8.579,4.94) -- (8.66,5.061) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (5.597,4.977) -- (5.569,5.12) -- (5.488,5.241) -- (5.367,5.322) -- (5.224,5.35) -- (5.081,5.322) -- (4.96,5.241) -- (4.879,5.12) -- (4.851,4.977) -- (4.879,4.834) -- (4.96,4.713) -- (5.081,4.632) -- (5.224,4.604) -- (5.367,4.632) -- (5.488,4.713) -- (5.569,4.834) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (10.972,4.617) -- (10.944,4.76) -- (10.863,4.881) -- (10.742,4.962) -- (10.599,4.99) -- (10.456,4.962) -- (10.335,4.881) -- (10.254,4.76) -- (10.226,4.617) -- (10.254,4.474) -- (10.335,4.353) -- (10.456,4.272) -- (10.599,4.244) -- (10.742,4.272) -- (10.863,4.353) -- (10.944,4.474) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (11.369,2.036) -- (11.34,2.179) -- (11.259,2.3) -- (11.138,2.381) -- (10.995,2.409) -- (10.853,2.381) -- (10.732,2.3) -- (10.651,2.179) -- (10.622,2.036) -- (10.651,1.893) -- (10.732,1.772) -- (10.853,1.691) -- (10.995,1.663) -- (11.138,1.691) -- (11.259,1.772) -- (11.34,1.893) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (7.997,1.567) -- (7.968,1.71) -- (7.887,1.831) -- (7.766,1.912) -- (7.624,1.94) -- (7.481,1.912) -- (7.36,1.831) -- (7.279,1.71) -- (7.25,1.567) -- (7.279,1.424) -- (7.36,1.303) -- (7.481,1.222) -- (7.624,1.194) -- (7.766,1.222) -- (7.887,1.303) -- (7.968,1.424) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (11.008,9.659) -- (11.126,9.678) -- (11.234,9.733) -- (11.319,9.818) -- (11.373,9.925) -- (11.392,10.044) -- (11.373,10.162) -- (11.319,10.27) -- (11.234,10.355) -- (11.126,10.409) -- (11.008,10.428) -- (11.008,10.428) -- (10.889,10.409) -- (10.782,10.355) -- (10.696,10.27) -- (10.642,10.162) -- (10.623,10.044) -- (10.642,9.925) -- (10.696,9.818) -- (10.782,9.733) -- (10.889,9.678) -- (11.008,9.659) -- cycle;
\node at (11.008,10.044) {\scalebox{1.571}{\small 1}};
\filldraw[fill=white, draw=black, line width=0.5pt] (3.203,10.326) -- (3.322,10.344) -- (3.429,10.399) -- (3.514,10.484) -- (3.568,10.591) -- (3.587,10.71) -- (3.568,10.829) -- (3.514,10.936) -- (3.429,11.021) -- (3.322,11.076) -- (3.203,11.095) -- (3.203,11.095) -- (3.084,11.076) -- (2.977,11.021) -- (2.892,10.936) -- (2.837,10.829) -- (2.818,10.71) -- (2.837,10.591) -- (2.892,10.484) -- (2.977,10.399) -- (3.084,10.344) -- (3.203,10.326) -- cycle;
\node at (3.203,10.71) {\scalebox{1.571}{\small 2}};
\filldraw[fill=white, draw=black, line width=0.5pt] (9.052,11.035) -- (9.171,11.053) -- (9.278,11.108) -- (9.363,11.193) -- (9.418,11.3) -- (9.436,11.419) -- (9.418,11.538) -- (9.363,11.645) -- (9.278,11.73) -- (9.171,11.785) -- (9.052,11.804) -- (9.052,11.804) -- (8.933,11.785) -- (8.826,11.73) -- (8.741,11.645) -- (8.686,11.538) -- (8.667,11.419) -- (8.686,11.3) -- (8.741,11.193) -- (8.826,11.108) -- (8.933,11.053) -- (9.052,11.035) -- cycle;
\node at (9.052,11.419) {\scalebox{1.571}{\small 3}};
\filldraw[fill=white, draw=black, line width=0.5pt] (8.022,9.097) -- (8.141,9.116) -- (8.248,9.171) -- (8.333,9.256) -- (8.388,9.363) -- (8.407,9.482) -- (8.388,9.601) -- (8.333,9.708) -- (8.248,9.793) -- (8.141,9.848) -- (8.022,9.866) -- (8.022,9.866) -- (7.903,9.848) -- (7.796,9.793) -- (7.711,9.708) -- (7.656,9.601) -- (7.638,9.482) -- (7.656,9.363) -- (7.711,9.256) -- (7.796,9.171) -- (7.903,9.116) -- (8.022,9.097) -- cycle;
\node at (8.022,9.482) {\scalebox{1.571}{\small 4}};
\filldraw[fill=white, draw=black, line width=0.5pt] (5.917,10.645) -- (6.035,10.664) -- (6.143,10.719) -- (6.228,10.804) -- (6.282,10.911) -- (6.301,11.03) -- (6.282,11.148) -- (6.228,11.256) -- (6.143,11.341) -- (6.035,11.395) -- (5.917,11.414) -- (5.917,11.414) -- (5.798,11.395) -- (5.691,11.341) -- (5.606,11.256) -- (5.551,11.148) -- (5.532,11.03) -- (5.551,10.911) -- (5.606,10.804) -- (5.691,10.719) -- (5.798,10.664) -- (5.917,10.645) -- cycle;
\node at (5.917,11.03) {\scalebox{1.571}{\small 5}};
\filldraw[fill=white, draw=black, line width=0.5pt] (4.905,9.208) -- (5.024,9.227) -- (5.131,9.282) -- (5.216,9.367) -- (5.271,9.474) -- (5.289,9.593) -- (5.271,9.712) -- (5.216,9.819) -- (5.131,9.904) -- (5.024,9.958) -- (4.905,9.977) -- (4.905,9.977) -- (4.786,9.958) -- (4.679,9.904) -- (4.594,9.819) -- (4.539,9.712) -- (4.52,9.593) -- (4.539,9.474) -- (4.594,9.367) -- (4.679,9.282) -- (4.786,9.227) -- (4.905,9.208) -- cycle;
\node at (4.905,9.593) {\scalebox{1.571}{\small 6}};
\filldraw[fill=white, draw=black, line width=0.5pt] (10.874,6.186) -- (10.993,6.205) -- (11.1,6.259) -- (11.186,6.344) -- (11.24,6.451) -- (11.259,6.57) -- (11.24,6.689) -- (11.186,6.796) -- (11.1,6.881) -- (10.993,6.936) -- (10.874,6.955) -- (10.874,6.955) -- (10.756,6.936) -- (10.648,6.881) -- (10.563,6.796) -- (10.509,6.689) -- (10.49,6.57) -- (10.509,6.451) -- (10.563,6.344) -- (10.648,6.259) -- (10.756,6.205) -- (10.874,6.186) -- cycle;
\node at (10.874,6.57) {\scalebox{1.571}{\small 7}};
\filldraw[fill=white, draw=black, line width=0.5pt] (6.089,8.396) -- (6.207,8.415) -- (6.315,8.47) -- (6.4,8.555) -- (6.454,8.662) -- (6.473,8.781) -- (6.454,8.9) -- (6.4,9.007) -- (6.315,9.092) -- (6.207,9.147) -- (6.089,9.165) -- (6.089,9.165) -- (5.97,9.147) -- (5.863,9.092) -- (5.778,9.007) -- (5.723,8.9) -- (5.704,8.781) -- (5.723,8.662) -- (5.778,8.555) -- (5.863,8.47) -- (5.97,8.415) -- (6.089,8.396) -- cycle;
\node at (6.089,8.781) {\scalebox{1.571}{\small 8}};
\filldraw[fill=white, draw=black, line width=0.5pt] (5.057,6.381) -- (5.176,6.4) -- (5.283,6.455) -- (5.368,6.54) -- (5.423,6.647) -- (5.441,6.766) -- (5.423,6.884) -- (5.368,6.992) -- (5.283,7.077) -- (5.176,7.131) -- (5.057,7.15) -- (5.057,7.15) -- (4.938,7.131) -- (4.831,7.077) -- (4.746,6.992) -- (4.691,6.884) -- (4.672,6.766) -- (4.691,6.647) -- (4.746,6.54) -- (4.831,6.455) -- (4.938,6.4) -- (5.057,6.381) -- cycle;
\node at (5.057,6.766) {\scalebox{1.571}{\small 9}};
\filldraw[fill=white, draw=black, line width=0.5pt] (9.276,8.433) -- (9.395,8.452) -- (9.502,8.506) -- (9.587,8.592) -- (9.642,8.699) -- (9.66,8.818) -- (9.642,8.936) -- (9.587,9.044) -- (9.502,9.129) -- (9.395,9.183) -- (9.276,9.202) -- (8.914,9.202) -- (8.795,9.183) -- (8.688,9.129) -- (8.603,9.044) -- (8.548,8.936) -- (8.53,8.818) -- (8.548,8.699) -- (8.603,8.592) -- (8.688,8.506) -- (8.795,8.452) -- (8.914,8.433) -- cycle;
\node at (9.095,8.818) {\scalebox{1.571}{\small 10}};
\filldraw[fill=white, draw=black, line width=0.5pt] (8.411,6.321) -- (8.53,6.339) -- (8.637,6.394) -- (8.722,6.479) -- (8.777,6.586) -- (8.796,6.705) -- (8.777,6.824) -- (8.722,6.931) -- (8.637,7.016) -- (8.53,7.071) -- (8.411,7.09) -- (8.049,7.09) -- (7.931,7.071) -- (7.823,7.016) -- (7.738,6.931) -- (7.684,6.824) -- (7.665,6.705) -- (7.684,6.586) -- (7.738,6.479) -- (7.823,6.394) -- (7.931,6.339) -- (8.049,6.321) -- cycle;
\node at (8.23,6.705) {\scalebox{1.571}{\small 11}};
\filldraw[fill=white, draw=black, line width=0.5pt] (3.534,5.357) -- (3.653,5.376) -- (3.76,5.43) -- (3.845,5.515) -- (3.9,5.622) -- (3.919,5.741) -- (3.9,5.86) -- (3.845,5.967) -- (3.76,6.052) -- (3.653,6.107) -- (3.534,6.126) -- (3.172,6.126) -- (3.053,6.107) -- (2.946,6.052) -- (2.861,5.967) -- (2.807,5.86) -- (2.788,5.741) -- (2.807,5.622) -- (2.861,5.515) -- (2.946,5.43) -- (3.053,5.376) -- (3.172,5.357) -- cycle;
\node at (3.353,5.741) {\scalebox{1.571}{\small 12}};
\filldraw[fill=white, draw=black, line width=0.5pt] (9.749,4.958) -- (9.868,4.976) -- (9.975,5.031) -- (10.06,5.116) -- (10.115,5.223) -- (10.134,5.342) -- (10.115,5.461) -- (10.06,5.568) -- (9.975,5.653) -- (9.868,5.708) -- (9.749,5.727) -- (9.387,5.727) -- (9.268,5.708) -- (9.161,5.653) -- (9.076,5.568) -- (9.022,5.461) -- (9.003,5.342) -- (9.022,5.223) -- (9.076,5.116) -- (9.161,5.031) -- (9.268,4.976) -- (9.387,4.958) -- cycle;
\node at (9.568,5.342) {\scalebox{1.571}{\small 13}};
\filldraw[fill=white, draw=black, line width=0.5pt] (8.678,2.901) -- (8.797,2.919) -- (8.904,2.974) -- (8.989,3.059) -- (9.044,3.166) -- (9.063,3.285) -- (9.044,3.404) -- (8.989,3.511) -- (8.904,3.596) -- (8.797,3.651) -- (8.678,3.67) -- (8.316,3.67) -- (8.197,3.651) -- (8.09,3.596) -- (8.005,3.511) -- (7.951,3.404) -- (7.932,3.285) -- (7.951,3.166) -- (8.005,3.059) -- (8.09,2.974) -- (8.197,2.919) -- (8.316,2.901) -- cycle;
\node at (8.497,3.285) {\scalebox{1.571}{\small 14}};
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\noindent{\small\itshape Deux carrefours reliés par une rue n'ont jamais la même couleur.}\par\addvspace{0.4em}
\noindent \textbf{1.} Le coloriage est \textbf{forcé} : une fois la couleur d'un carrefour choisie, celle de tous les autres suit, de proche en proche.\par\addvspace{0.35em}
\begin{center}
\renewcommand{\arraystretch}{1.35}
\begin{tabular}{|c|c|c|}
\hline
\cellcolor{blue!7}\bfseries Couleur & \cellcolor{blue!7}\bfseries Carrefours & \cellcolor{blue!7}\bfseries Nombre \\ \hline
sombres & A, D, G, J, K, M & 6 \\ \hline
clairs & B, C, E, F, H, I, L & 7 \\ \hline
\end{tabular}
\end{center}
\noindent{\color{red!80!black}\bfseries Il y a \textbf{6} carrefours sombres et \textbf{7} clairs. Il y en a donc \textbf{1 de plus} du côté des clairs.}\par\addvspace{0.4em}
\noindent \textbf{2.}\par\addvspace{0.35em}
\noindent{\color{green!45!black}\textbf{Le raisonnement clé.} Chaque rue relie un carrefour sombre à un carrefour clair. Donc à chaque fois que le car roule, il \textbf{change de couleur} : ses arrêts sont sombre, clair, sombre, clair\dots{} \textbf{en alternance}.}\par\addvspace{0.4em}
\noindent{\color{red!80!black}\bfseries Une tournée qui dessert les 13 carrefours alterne donc les deux couleurs d'un bout à l'autre : elle en utilise \textbf{autant de chaque, à un près}. Et si elle en utilise un de plus d'une couleur, c'est forcément celle de son \textbf{départ} et de son \textbf{arrivée}.}\par\addvspace{0.4em}
\noindent \textbf{3.}\par\addvspace{0.35em}
\noindent{\color{red!80!black}\bfseries \textbf{Non.} Un circuit revient à son point de départ : il compte autant d'arrêts sombres que de clairs. Or ce quartier a 6 carrefours sombres et 7 clairs — c'est impossible.}\par\addvspace{0.4em}
\noindent \textbf{4.}\par\addvspace{0.35em}
\noindent{\color{red!80!black}\bfseries \textbf{Non plus.} Avec un carrefour clair de plus, la tournée doit \textbf{partir et arriver} sur un carrefour clair. Or l'école est en \textbf{M}, qui est sombre.}\par\addvspace{0.4em}
\noindent{\color{green!45!black}Une tournée existe pourtant dans ce quartier : il suffirait d'installer l'école sur un carrefour clair. Ce n'est pas le plan qui est en cause, c'est l'endroit d'où l'on part.}\par\addvspace{0.4em}
\end{document}
