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     EduGorilla 
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    Four persons entered the lift cabin on the ground floor of a seven-storied house. Suppose that each of them independently and with equal probability can leave the cabin at any floor beginning with the first. Find out the probability of all four persons leaving at different floors.

    Options :-

    1. 5/36
    2. 5/9
    3. 5/6
    4. None of these
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