Mathematics
Senior High
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ここの計算の過程を詳しく教えてください🙇♀️
(2) 求める和は, 初項2" - 1, 公差 2, 項数 2"-1
の等差数列の和であるから
1 ..2"-1{2(2″-1)+(2”-1_1)・2}
2
=3.4n-1-2"
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理解出来ました！ありがとうございました！