問題詳情
23. 甲、乙兩人打靶，根據以前的統計資料顯示，甲、乙兩人命中率分別為 3/4與 4/ 5。若兩人的打靶互不影響，且每人對同一靶面各射擊一發，則此靶面恰中一發的機率為：
(A) 3/4
(B) 4/5
(C) 1/20
(D) 7/20。
(A) 3/4
(B) 4/5
(C) 1/20
(D) 7/20。
參考答案
答案：D
難度：適中0.590909
統計：A(3),B(3),C(3),D(13),E(0)
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