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```        Five persons entered the lift cabin on the ground floor of an 8 - floor house. Suppose each of them can leave the cabin independently at any floor beginning with the first. Find the total no. of ways in which all the five persons can leave the cabin at different floors.
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7 years ago

147 Points
```										Dear Sanchit Gupta
1st  person can leave at any of seven floors in 7 ways
2nd  person can leave at any of seven floors in 6 ways
3rd person can leave at any of seven floors in 5 ways
4th person can leave at any of seven floors in 4 ways
5th person can leave at any of seven floors in 3 ways
total ways =7*6*5*4*3 =2520

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7 years ago
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