Question

Five persons entered the lift cabin of an 8-floor building. if each of cabin independently at any floor first; find the total number of ways five persons can leave the cabin: 7 floors and (ii) at different floors on the ground floor them can leave the beginning with the in which each of the at any one of the

Answer 1

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