[猜謎] 神魔之塔石抽白金卡的期望值?
假設抽到白金卡價值600元
金卡價值300元
銀卡價值150元
神魔之塔石抽白金卡的期望值?
答:350 600 x1/3 + 300x1/3+150x1/3=350
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