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Sanchit Gupta Grade: 12
        

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.


 

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
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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Badiuddin

7 years ago
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