Mathematics
Senior High

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39 一般項が 2n3-1で表される数列の初項から第n項までの和 S=2.1+4.3+6.32+...... +2n.3n-1 を求めよ。
数列

Answers

こういう(等差数列)×(等比数列)の和の問題はだいたい
(等比数列の公比)×S-Sをすれば上手くいきます

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