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全概率： P(A_1) = 0,3, P(A_2) = 0,5, P(A_3) = 0,2 ，。？（答：。）
全概率： P(A_1) = 0,3, P(A_2) = 0,5, P(A_3) = 0,2 ，。？（答：。）
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