Mathematics
Senior High
(2)の数列の第k項が初項1、公比3、項数kの等比数列の和で表される理由がわかりません……
*(1)
(2) 12+1・2+2,2' +2・3+32, 3°+3・4+4°,
34 次の数列の和を求めよ。
*(1) 1(n+1) 2.(n+2) 3·(n+3)
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