Mathematics
Senior High
Resolved

どのように計算すると、下の段になるのか教えて頂きたいです🙇‍♀️🙇‍♀️

n-1 an = a ₁ + Σ 3k =1+ a An k=1 (3" -1) 3(3n-1-1) 3-1

Answers

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