✨ Best Answer ✨
(第n項～第2n項まで足し続けたもの)
=(第1項～第2n項まで足し続けたもの)
－(第1項～第n－1項まで足し続けたもの)
になるから⬇みたいに考えたらいいと思います！
計算ミスってたらすみません🙇♀️
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