Mathematics
Senior High

(4)の答えでどうしてΣの上がn+1になるのか分かりません。

(4) 1 2-6+18-54+・・・・・・+2・(-3)" 1\2-1) 1
(4) 2(-3)*-1-2(1-(-3)*+1) 1- (-3) -40-(-3¹) n+1 k=1 11

Answers

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