Mathematics
Senior High
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チャレンジ 次の数列の第ん項を求めよ。 また, 初項から第n項までの和を求めよ。
(1) 1.2, 2.7, 3.12, 4.17,
n.(5η-3)
n
12
(4) 1, 1+3, 1+3+9, 1+3+9+27,
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