Mathematics
Senior High
(3)の解説お願いします
次の条件を満たす整数の組 (X1,X2, xs)は何個あるか。
(1) 1≦x<x<x≦10
(2) 15≤10
(3) 1≦x<X2<x≦10 記号≪ ここでは、xx2
シューズ2 を表す)
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