問題詳情

24.擲三枚相同且均勻的銅板各一次，每個銅板出現正面與反面出現的機會均等，則在已知至少出現一個正面的情形下，求恰好出現兩個正面的機率是多少？
(A)


(B)


(C)


(D)

。 

參考答案

答案：C
難度：適中0.428571
統計：A(2),B(1),C(3),D(0),E(0)

用户評論

【用戶】lucy

【年級】國一上

【評論內容】將題目中的反面改成正面出處https://www.google.com.tw/url?sa=t&source=web&rct=j&url=http://math1.ck.tp.edu.tw/%25E9%2599%25B3%25E5%2598%25AF%25E8%2599%258E/%25E5%25B0%258F%25E8%2599%258E/99%25E8%25AA%25B2%25E7%25B6%25B1/%25E7%25AC%25AC%25E4%25BA%258C%25E5%2586%258A/%25E7%25B7%25B4%25E7%25BF%2592%25E9%25A1%258C/99%25E8%25AA%25B2%25E7%25B6%25B12-3-3%25E6%25A9%259F%25E7%258E%2587-%25E6%25A2%259D%25E4%25BB%25B6%25E6%25A9%259F%25E7%258E%2587%25E8%2588%2587%25E8%25B2%259D%25E6%25B0%258F%25E5%25AE%259A%25E7%2590%2586(%25E7%25B7%25B4%25E7%25BF%2592%25E9%25A1%258C)%25E5%2596%25AE%25E9%2581%25...