"Five persons entered the lift cabin on the ground floor of an 8-floor   house. Suppose each of them
Channel: Doubtnut
Date: 2020-07-12

"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 number of ways in which each of the   five persons can leave the cabin (i) at any one of   the 7 floors (ii) at different floors."