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https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q12248341617
Mathematics
Senior High
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至急解説お願いします！
答えは（n−1）3^n＋1
(5) 数列 1・1,33,5.3%, ..., (2m-1)・3*-1 の和を求めよ。
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