問題詳情
E.有一種遊戲，每次輸贏規則如下：先從 至 中選定一個號碼 n，再擲三顆公正的骰子。若三顆骰子的點數全都是 n，則可贏 元；恰有兩個點數為 n，則可贏 元；恰有一個點數為 n，則可贏 元；而沒有點數為 n，則輸 元。如此玩一次的期望值（贏為正，輸為負）為 
元。
元。
參考答案
答案：B
難度：非常簡單0.952381
統計：A(15),B(380),C(1),D(3),E(0)
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