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6.從2到21的20個整數中,依序隨機挑選兩個相異數字a、b。假設每組數對(a,b)被挑選到的機率皆相同,試問挑出的數對(a,b)使得 為整數的機率為何?(A) (B) (C) (D)
問題詳情
6.從2到21的20個整數中,依序隨機挑選兩個相異數字a、b。假設每組數對(a,b)被挑選到的機率皆相同,試問挑出的數對(a,b)使得
為整數的機率為何?
(A)
(B)
(C)
(D)
參考答案
答案:B
難度:
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