Mathematics
Senior High
５の倍数のやり方教えてください。
3×5×,P。=3×5×5·4=D300(通り)
[1], [2] から、求める個数は,和の法則により
120+ 300 = 420(個)
7個の数字0, 1, 2, 3, 4, 5,6のうち異なる5個を並べて, 5桁の整数を作るとき
三数は何個作れるか。
一圏p.3
偶数
(2) 5 の倍数
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