Mathematics
Senior High
答えは1/3n(n➕1)(4nー1)なんですけどなぜですか？教えてください
B 問題
60 次の数列の和を求めよ。
(1)* 2(2n-1), 4(2n-2), 6(2n-3),
2
44-201
2n(2n-n)
Answers
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