問題詳情
3.箱中有三顆紅球與三顆白球。一摸彩遊戲是從箱中隨機同時抽出兩顆球。如果抽出的兩球顏色不同，則得獎金 100元；如果兩球顏色相同，則無獎金。請問此遊戲獎金的期望值為何？
(A) 20元
(B) 30元
(C) 40元
(D) 50元
(E) 60元
(A) 20元
(B) 30元
(C) 40元
(D) 50元
(E) 60元
參考答案
無參考答案
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