問題詳情
6. 設籤筒中有 支籤，其中恰 支有獎，今有 人依序抽籤（取後不放回），已知第 人中獎的機率為a，第 人中獎的機率為b，則（a，b）＝____________
參考答案
答案：A
難度：簡單0.892626
統計：A(1380),B(28),C(16),D(20),E(0)
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