一道gre 一个实验产生的结果要么是X要么是Y,然后如果这一次结果是X那么下一次是X的概率是0.3,如果这一次结果是Y那么下一次是Y的概率是0.4,问如果5th实验的结果是X,7th实验的结果是X的概率

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