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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.
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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