5 persons entered a lift cabin in the cellar of a 7 -floor building apart from cellar. If each of them independently and with equal probability can leave the cabin at any floor out of the 7 floors beginning with the first, then the probability of all the 5 persons leaving the cabin at different floors is
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Total floors 
Total number of ways to exit 
If 5 persons leave at 5 different floors then number of ways 
arranging 5 people in 7 ways 
Required probability 
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