Mathematics
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ここの途中式を教えて下さい😢🙇🏻‍♀️

****** 3² (3-¹-1) =1・3+2・ 3-1 =-2(n-1)3"+1-6 -(2n-1)3 +1
数列

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✨ Best Answer ✨

下記の通りです。
最終行は-2・3^n+1でくくっています。

rikonyan

ありがとうございます🙇🏻‍♀️

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