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解答と大まかな解説を教えて貰えたら
嬉しいです！Σが苦手です。
n-l
(1) 2
K=1
2K
(2) 1
K=1
(3)
K=1
(4)
K=1
3k
Answers
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分かりやすかったです！！
ありがとうございました😊