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n=kの時
...................(2k-2)(2k-1)2k
n=k+1の時
...................{2(k+1)-2}{2(k+1)-1}{2(k+1)}
=.................2k(2k+1)2(k+1)

とてもわかりやすかったです!
助かりました、ありがとうございます😊

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