Mathematics
Senior High
Solved
なぜ2×n(n-1)/2・1になるのかがわからないです。
n(n-1)
(1) 2月Cn-2+»Cn-1=2»C2+»Ci=2×
+n=n?
2·1
T0〇00
よって
n=9
nは2以上の整数であるから
n=3
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