格子点で見る！場合の数(東大理類数学) [数学a] 確率、整数の性質 ［数学Ⅱ] 図形と方程式
Synopsis
白がn個で赤が3個。ある条件のもとで環状に並べたときの並び方の総数。きちんと数えたいときは座標空間内の格子点と考えると ...
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