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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 C, 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 rue du Puits & Ⓑ Place du Vieux-Puits & Ⓛ Place de la Fontaine \\ \hline
① rue de la Mairie & ⑪ chemin des Vignes & Ⓒ Rond-point de la Gare & Ⓜ Place de l'Église \\ \hline
② rue Haute & ⑫ rue des Lilas & Ⓓ Carrefour Saint-Roch & \cellcolor{black!32}\bfseries Les bâtiments \\ \hline
③ rue Verte & ⑬ chemin de Ronde & Ⓔ Carrefour du Lavoir & \textbf{a} l'école \\ \hline
④ allée des Peupliers & ⑭ rue des Jardins & Ⓕ Carrefour de la Mairie & \textbf{b} la salle des fêtes \\ \hline
⑤ sentier des Prés & ⑮ rue du Stade & Ⓖ Place du Marché & \textbf{c} le gymnase \\ \hline
⑥ rue du Moulin & ⑯ passage du Marché & Ⓗ Rond-point de la Poste & \textbf{d} le stade \\ \hline
⑦ rue Basse & ⑰ impasse du Vieux-Four & Ⓘ Carrefour de l'Hôpital &  \\ \hline
⑧ rue du Pont & \cellcolor{black!32}\bfseries Les carrefours & Ⓙ Carrefour du Moulin &  \\ \hline
⑨ chemin Creux & Ⓐ Coin du Lavoir & Ⓚ Place aux Herbes &  \\ \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] (1.514,7.484) -- (1.538,7.245) -- (1.556,7.006) -- (1.568,6.766) -- (1.574,6.527) -- (1.575,6.287) -- (1.57,6.047) -- (1.56,5.807) -- (1.544,5.568) -- (1.522,5.329) -- (1.495,5.09) -- (1.462,4.853) -- (1.424,4.616) -- (1.38,4.38) -- (1.33,4.146);
\draw[line width=0.5pt] (7.825,4.635) -- (8.002,4.584) -- (8.18,4.537) -- (8.359,4.494) -- (8.539,4.455) -- (8.72,4.42) -- (8.902,4.39) -- (9.084,4.364) -- (9.267,4.342) -- (9.451,4.325) -- (9.634,4.312) -- (9.819,4.303) -- (10.003,4.299) -- (10.187,4.299) -- (10.371,4.303);
\draw[line width=0.5pt] (3.995,4.517) -- (4.266,4.567) -- (4.537,4.611) -- (4.809,4.648) -- (5.082,4.679) -- (5.356,4.704) -- (5.631,4.722) -- (5.905,4.734) -- (6.18,4.739) -- (6.455,4.738) -- (6.73,4.731) -- (7.005,4.716) -- (7.279,4.696) -- (7.552,4.669) -- (7.825,4.635);
\draw[line width=0.5pt] (10.371,4.303) -- (10.406,4.088) -- (10.446,3.875) -- (10.491,3.662) -- (10.541,3.45) -- (10.596,3.239) -- (10.656,3.03) -- (10.721,2.823) -- (10.791,2.616) -- (10.865,2.412) -- (10.945,2.209) -- (11.029,2.008) -- (11.118,1.81) -- (11.211,1.613) -- (11.309,1.419);
\draw[line width=0.5pt] (1.33,4.146) -- (1.515,4.201) -- (1.701,4.252) -- (1.888,4.299) -- (2.077,4.341) -- (2.266,4.379) -- (2.456,4.412) -- (2.647,4.441) -- (2.839,4.466) -- (3.031,4.485) -- (3.224,4.501) -- (3.417,4.512) -- (3.61,4.518) -- (3.803,4.519) -- (3.995,4.517);
\draw[line width=0.5pt] (7.436,1.72) -- (7.707,1.656) -- (7.98,1.599) -- (8.254,1.548) -- (8.529,1.504) -- (8.805,1.466) -- (9.082,1.435) -- (9.36,1.41) -- (9.638,1.392) -- (9.917,1.38) -- (10.196,1.375) -- (10.475,1.376) -- (10.753,1.384) -- (11.031,1.398) -- (11.309,1.419);
\filldraw[fill=black!38, draw=black, line width=0.5pt] (4.364,11.419) -- (4.336,11.562) -- (4.255,11.683) -- (4.134,11.764) -- (3.991,11.793) -- (3.848,11.764) -- (3.727,11.683) -- (3.646,11.562) -- (3.618,11.419) -- (3.646,11.277) -- (3.727,11.156) -- (3.848,11.075) -- (3.991,11.046) -- (4.134,11.075) -- (4.255,11.156) -- (4.336,11.277) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (10.852,11.402) -- (10.823,11.545) -- (10.742,11.666) -- (10.621,11.747) -- (10.479,11.775) -- (10.336,11.747) -- (10.215,11.666) -- (10.134,11.545) -- (10.105,11.402) -- (10.134,11.259) -- (10.215,11.138) -- (10.336,11.057) -- (10.479,11.029) -- (10.621,11.057) -- (10.742,11.138) -- (10.823,11.259) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (7.981,10.844) -- (7.952,10.987) -- (7.871,11.108) -- (7.75,11.189) -- (7.608,11.218) -- (7.465,11.189) -- (7.344,11.108) -- (7.263,10.987) -- (7.234,10.844) -- (7.263,10.702) -- (7.344,10.581) -- (7.465,10.5) -- (7.608,10.471) -- (7.75,10.5) -- (7.871,10.581) -- (7.952,10.702) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (8.097,8.192) -- (8.068,8.335) -- (7.988,8.456) -- (7.866,8.537) -- (7.724,8.565) -- (7.581,8.537) -- (7.46,8.456) -- (7.379,8.335) -- (7.35,8.192) -- (7.379,8.049) -- (7.46,7.928) -- (7.581,7.847) -- (7.724,7.819) -- (7.866,7.847) -- (7.988,7.928) -- (8.068,8.049) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (4.56,8.13) -- (4.531,8.273) -- (4.45,8.394) -- (4.329,8.475) -- (4.186,8.503) -- (4.044,8.475) -- (3.922,8.394) -- (3.842,8.273) -- (3.813,8.13) -- (3.842,7.987) -- (3.922,7.866) -- (4.044,7.785) -- (4.186,7.757) -- (4.329,7.785) -- (4.45,7.866) -- (4.531,7.987) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (11.236,7.916) -- (11.208,8.058) -- (11.127,8.179) -- (11.006,8.26) -- (10.863,8.289) -- (10.72,8.26) -- (10.599,8.179) -- (10.518,8.058) -- (10.49,7.916) -- (10.518,7.773) -- (10.599,7.652) -- (10.72,7.571) -- (10.863,7.542) -- (11.006,7.571) -- (11.127,7.652) -- (11.208,7.773) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (1.888,7.484) -- (1.859,7.626) -- (1.778,7.747) -- (1.657,7.828) -- (1.514,7.857) -- (1.372,7.828) -- (1.25,7.747) -- (1.17,7.626) -- (1.141,7.484) -- (1.17,7.341) -- (1.25,7.22) -- (1.372,7.139) -- (1.514,7.11) -- (1.657,7.139) -- (1.778,7.22) -- (1.859,7.341) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (8.198,4.635) -- (8.17,4.778) -- (8.089,4.899) -- (7.968,4.98) -- (7.825,5.009) -- (7.682,4.98) -- (7.561,4.899) -- (7.48,4.778) -- (7.452,4.635) -- (7.48,4.493) -- (7.561,4.372) -- (7.682,4.291) -- (7.825,4.262) -- (7.968,4.291) -- (8.089,4.372) -- (8.17,4.493) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (4.369,4.517) -- (4.34,4.659) -- (4.259,4.78) -- (4.138,4.861) -- (3.995,4.89) -- (3.853,4.861) -- (3.732,4.78) -- (3.651,4.659) -- (3.622,4.517) -- (3.651,4.374) -- (3.732,4.253) -- (3.853,4.172) -- (3.995,4.143) -- (4.138,4.172) -- (4.259,4.253) -- (4.34,4.374) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (10.744,4.303) -- (10.716,4.446) -- (10.635,4.567) -- (10.514,4.648) -- (10.371,4.676) -- (10.228,4.648) -- (10.107,4.567) -- (10.026,4.446) -- (9.998,4.303) -- (10.026,4.16) -- (10.107,4.039) -- (10.228,3.958) -- (10.371,3.93) -- (10.514,3.958) -- (10.635,4.039) -- (10.716,4.16) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (1.703,4.146) -- (1.675,4.289) -- (1.594,4.41) -- (1.473,4.491) -- (1.33,4.519) -- (1.187,4.491) -- (1.066,4.41) -- (0.985,4.289) -- (0.957,4.146) -- (0.985,4.003) -- (1.066,3.882) -- (1.187,3.801) -- (1.33,3.773) -- (1.473,3.801) -- (1.594,3.882) -- (1.675,4.003) -- cycle;
\filldraw[fill=black!38, draw=black, line width=0.5pt] (7.809,1.72) -- (7.781,1.863) -- (7.7,1.984) -- (7.579,2.065) -- (7.436,2.093) -- (7.293,2.065) -- (7.172,1.984) -- (7.091,1.863) -- (7.063,1.72) -- (7.091,1.577) -- (7.172,1.456) -- (7.293,1.375) -- (7.436,1.347) -- (7.579,1.375) -- (7.7,1.456) -- (7.781,1.577) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (11.682,1.419) -- (11.654,1.562) -- (11.573,1.683) -- (11.452,1.764) -- (11.309,1.793) -- (11.166,1.764) -- (11.045,1.683) -- (10.964,1.562) -- (10.936,1.419) -- (10.964,1.277) -- (11.045,1.156) -- (11.166,1.075) -- (11.309,1.046) -- (11.452,1.075) -- (11.573,1.156) -- (11.654,1.277) -- cycle;
\filldraw[fill=white, draw=black, line width=0.5pt] (5.836,10.978) -- (5.955,10.997) -- (6.062,11.051) -- (6.147,11.136) -- (6.202,11.244) -- (6.22,11.362) -- (6.202,11.481) -- (6.147,11.589) -- (6.062,11.674) -- (5.955,11.728) -- (5.836,11.747) -- (5.836,11.747) -- (5.717,11.728) -- (5.61,11.674) -- (5.525,11.589) -- (5.47,11.481) -- (5.451,11.362) -- (5.47,11.244) -- (5.525,11.136) -- (5.61,11.051) -- (5.717,10.997) -- (5.836,10.978) -- cycle;
\node at (5.836,11.362) {\scalebox{1.608}{\small 1}};
\filldraw[fill=white, draw=black, line width=0.5pt] (4.608,9.421) -- (4.727,9.44) -- (4.834,9.495) -- (4.919,9.58) -- (4.974,9.687) -- (4.993,9.806) -- (4.974,9.924) -- (4.919,10.032) -- (4.834,10.117) -- (4.727,10.171) -- (4.608,10.19) -- (4.608,10.19) -- (4.489,10.171) -- (4.382,10.117) -- (4.297,10.032) -- (4.242,9.924) -- (4.224,9.806) -- (4.242,9.687) -- (4.297,9.58) -- (4.382,9.495) -- (4.489,9.44) -- (4.608,9.421) -- cycle;
\node at (4.608,9.806) {\scalebox{1.608}{\small 2}};
\filldraw[fill=white, draw=black, line width=0.5pt] (10.909,9.3) -- (11.028,9.319) -- (11.135,9.374) -- (11.22,9.459) -- (11.275,9.566) -- (11.294,9.685) -- (11.275,9.804) -- (11.22,9.911) -- (11.135,9.996) -- (11.028,10.051) -- (10.909,10.069) -- (10.909,10.069) -- (10.79,10.051) -- (10.683,9.996) -- (10.598,9.911) -- (10.543,9.804) -- (10.525,9.685) -- (10.543,9.566) -- (10.598,9.459) -- (10.683,9.374) -- (10.79,9.319) -- (10.909,9.3) -- cycle;
\node at (10.909,9.685) {\scalebox{1.608}{\small 3}};
\filldraw[fill=white, draw=black, line width=0.5pt] (8.947,11.235) -- (9.066,11.253) -- (9.173,11.308) -- (9.258,11.393) -- (9.312,11.5) -- (9.331,11.619) -- (9.312,11.738) -- (9.258,11.845) -- (9.173,11.93) -- (9.066,11.985) -- (8.947,12.004) -- (8.947,12.004) -- (8.828,11.985) -- (8.721,11.93) -- (8.636,11.845) -- (8.581,11.738) -- (8.562,11.619) -- (8.581,11.5) -- (8.636,11.393) -- (8.721,11.308) -- (8.828,11.253) -- (8.947,11.235) -- cycle;
\node at (8.947,11.619) {\scalebox{1.608}{\small 4}};
\filldraw[fill=white, draw=black, line width=0.5pt] (7.172,9.112) -- (7.291,9.131) -- (7.398,9.186) -- (7.483,9.271) -- (7.538,9.378) -- (7.557,9.497) -- (7.538,9.615) -- (7.483,9.723) -- (7.398,9.808) -- (7.291,9.862) -- (7.172,9.881) -- (7.172,9.881) -- (7.053,9.862) -- (6.946,9.808) -- (6.861,9.723) -- (6.806,9.615) -- (6.788,9.497) -- (6.806,9.378) -- (6.861,9.271) -- (6.946,9.186) -- (7.053,9.131) -- (7.172,9.112) -- cycle;
\node at (7.172,9.497) {\scalebox{1.608}{\small 5}};
\filldraw[fill=white, draw=black, line width=0.5pt] (9.338,8.182) -- (9.457,8.201) -- (9.564,8.255) -- (9.649,8.34) -- (9.704,8.448) -- (9.723,8.566) -- (9.704,8.685) -- (9.649,8.792) -- (9.564,8.877) -- (9.457,8.932) -- (9.338,8.951) -- (9.338,8.951) -- (9.22,8.932) -- (9.112,8.877) -- (9.027,8.792) -- (8.973,8.685) -- (8.954,8.566) -- (8.973,8.448) -- (9.027,8.34) -- (9.112,8.255) -- (9.22,8.201) -- (9.338,8.182) -- cycle;
\node at (9.338,8.566) {\scalebox{1.608}{\small 6}};
\filldraw[fill=white, draw=black, line width=0.5pt] (8.012,6.036) -- (8.131,6.055) -- (8.238,6.109) -- (8.323,6.195) -- (8.378,6.302) -- (8.397,6.421) -- (8.378,6.539) -- (8.323,6.647) -- (8.238,6.732) -- (8.131,6.786) -- (8.012,6.805) -- (8.012,6.805) -- (7.893,6.786) -- (7.786,6.732) -- (7.701,6.647) -- (7.646,6.539) -- (7.628,6.421) -- (7.646,6.302) -- (7.701,6.195) -- (7.786,6.109) -- (7.893,6.055) -- (8.012,6.036) -- cycle;
\node at (8.012,6.421) {\scalebox{1.608}{\small 7}};
\filldraw[fill=white, draw=black, line width=0.5pt] (5.959,7.538) -- (6.078,7.557) -- (6.185,7.611) -- (6.27,7.697) -- (6.325,7.804) -- (6.344,7.923) -- (6.325,8.041) -- (6.27,8.149) -- (6.185,8.234) -- (6.078,8.288) -- (5.959,8.307) -- (5.959,8.307) -- (5.84,8.288) -- (5.733,8.234) -- (5.648,8.149) -- (5.593,8.041) -- (5.575,7.923) -- (5.593,7.804) -- (5.648,7.697) -- (5.733,7.611) -- (5.84,7.557) -- (5.959,7.538) -- cycle;
\node at (5.959,7.923) {\scalebox{1.608}{\small 8}};
\filldraw[fill=white, draw=black, line width=0.5pt] (4.326,5.926) -- (4.445,5.945) -- (4.552,6.0) -- (4.637,6.085) -- (4.692,6.192) -- (4.71,6.311) -- (4.692,6.43) -- (4.637,6.537) -- (4.552,6.622) -- (4.445,6.677) -- (4.326,6.695) -- (4.326,6.695) -- (4.207,6.677) -- (4.1,6.622) -- (4.015,6.537) -- (3.96,6.43) -- (3.941,6.311) -- (3.96,6.192) -- (4.015,6.085) -- (4.1,6.0) -- (4.207,5.945) -- (4.326,5.926) -- cycle;
\node at (4.326,6.311) {\scalebox{1.608}{\small 9}};
\filldraw[fill=white, draw=black, line width=0.5pt] (11.328,5.653) -- (11.447,5.671) -- (11.554,5.726) -- (11.639,5.811) -- (11.693,5.918) -- (11.712,6.037) -- (11.693,6.156) -- (11.639,6.263) -- (11.554,6.348) -- (11.447,6.403) -- (11.328,6.422) -- (10.966,6.422) -- (10.847,6.403) -- (10.74,6.348) -- (10.655,6.263) -- (10.6,6.156) -- (10.581,6.037) -- (10.6,5.918) -- (10.655,5.811) -- (10.74,5.726) -- (10.847,5.671) -- (10.966,5.653) -- cycle;
\node at (11.147,6.037) {\scalebox{1.608}{\small 10}};
\filldraw[fill=white, draw=black, line width=0.5pt] (3.148,6.938) -- (3.267,6.957) -- (3.374,7.012) -- (3.459,7.097) -- (3.514,7.204) -- (3.533,7.323) -- (3.514,7.442) -- (3.459,7.549) -- (3.374,7.634) -- (3.267,7.689) -- (3.148,7.707) -- (2.787,7.707) -- (2.668,7.689) -- (2.56,7.634) -- (2.475,7.549) -- (2.421,7.442) -- (2.402,7.323) -- (2.421,7.204) -- (2.475,7.097) -- (2.56,7.012) -- (2.668,6.957) -- (2.787,6.938) -- cycle;
\node at (2.967,7.323) {\scalebox{1.608}{\small 11}};
\filldraw[fill=white, draw=black, line width=0.5pt] (2.125,5.401) -- (2.244,5.42) -- (2.351,5.475) -- (2.436,5.56) -- (2.49,5.667) -- (2.509,5.786) -- (2.49,5.905) -- (2.436,6.012) -- (2.351,6.097) -- (2.244,6.152) -- (2.125,6.17) -- (1.763,6.17) -- (1.644,6.152) -- (1.537,6.097) -- (1.452,6.012) -- (1.397,5.905) -- (1.378,5.786) -- (1.397,5.667) -- (1.452,5.56) -- (1.537,5.475) -- (1.644,5.42) -- (1.763,5.401) -- cycle;
\node at (1.944,5.786) {\scalebox{1.608}{\small 12}};
\filldraw[fill=white, draw=black, line width=0.5pt] (9.315,4.361) -- (9.434,4.38) -- (9.541,4.434) -- (9.626,4.519) -- (9.681,4.627) -- (9.7,4.746) -- (9.681,4.864) -- (9.626,4.972) -- (9.541,5.057) -- (9.434,5.111) -- (9.315,5.13) -- (8.953,5.13) -- (8.834,5.111) -- (8.727,5.057) -- (8.642,4.972) -- (8.587,4.864) -- (8.569,4.746) -- (8.587,4.627) -- (8.642,4.519) -- (8.727,4.434) -- (8.834,4.38) -- (8.953,4.361) -- cycle;
\node at (9.134,4.746) {\scalebox{1.608}{\small 13}};
\filldraw[fill=white, draw=black, line width=0.5pt] (6.098,3.965) -- (6.217,3.984) -- (6.324,4.039) -- (6.409,4.124) -- (6.464,4.231) -- (6.483,4.35) -- (6.464,4.468) -- (6.409,4.576) -- (6.324,4.661) -- (6.217,4.715) -- (6.098,4.734) -- (5.736,4.734) -- (5.618,4.715) -- (5.51,4.661) -- (5.425,4.576) -- (5.371,4.468) -- (5.352,4.35) -- (5.371,4.231) -- (5.425,4.124) -- (5.51,4.039) -- (5.618,3.984) -- (5.736,3.965) -- cycle;
\node at (5.917,4.35) {\scalebox{1.608}{\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, B, D, G, I, J, L & 7 \\ \hline
clairs & C, E, F, H, K, M & 6 \\ \hline
\end{tabular}
\end{center}
\noindent{\color{red!80!black}\bfseries Il y a \textbf{7} carrefours sombres et \textbf{6} clairs. Il y en a donc \textbf{1 de plus} du côté des sombres.}\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 7 carrefours sombres et 6 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 sombre de plus, la tournée doit \textbf{partir et arriver} sur un carrefour sombre. Or l'école est en \textbf{C}, qui est clair.}\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 sombre. 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}
