Mathematics
Senior High
図とかでわかりやすく教えて欲しいです
4|[改訂版3TRIAL数学A 例題3]
7個の数字0, 1, 2, 3, 4, 5, 6のうち異なる4個を並べて,4桁の整数を作るとき,次
のような整数は何個作れるか。
(1) 4桁の整数
(2) 偶数
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