Mathematics
Senior High
数Bの問題です
2ｎ乗（2n－1乗－1）=の計算のやり方を教えてほしいです。
An = a₁ + Σ2² = 3 + Z2k
k=1
k=1
2(2-1-1) = 2" + 1
=
= 3+
2-1
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