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Openai/695b957c-ffe8-8008-97fb-d5a6cc3ba798
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===== 我個人認為,多數市面上的解法在這一題中需要區分與討論的情況過多, ===== 在考試情境下不僅耗時,也相當容易在計算或分類上出錯。 其癥結點在於: 多數解答將兩個座標點 P,QP, QP,Q 的樣本空間設定為 C(7,2)C(7,2)C(7,2)(即無序選取), 這樣的設定會使得後續在處理「內積為 1」與「內積為 2」時, 很難用精簡的排列組合技巧一次到位,反而必須反覆拆分情況。
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