Mathematics
Senior High
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22
57 4桁の自然数nの千の位, 百の位, 十の位、一の位の数字を、 それぞれ a,
b, c, d とする。 次の条件を満たす n は何個あるか。
(1) a>b>c>d
(2) a<b<c <d
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