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1行目の赤い点線がn-3個の積だからです

以下、※以降が赤い点線部を表します
(3/1)(2/3)(3/3)※(3/4)(3/5)(3/6)…(3/n)
≦(3/1)(2/3)(3/3)※(3/4)(3/4)(3/4)…(3/4)
=(3/1)(3/2)(3/3)※(3/4)ⁿ⁻³

おにぎり

ありがとうございます🙇‍♂️

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