Mathematics
Senior High
この問題の考え方を教えてほしいです。
7 7個の数字 0, 1,2,3,4,5,6の中から異なる数字を使ってできる, 次の
ような数は何個あるか。
(1) 5桁の整数
(2) 4桁の奇数
(1)
2160個
(2)
300 個
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