Four persons enter the lift of a six storey building at the ground floor. In how many ways can they get out of lift on any floor other than ground floor Choose the correct choice from the following
A) 625
B) 1296
C) 1540
D) 1478
E) 360
Each person out of 4 has 5 floors (options) to get out of (since no one gets out on the ground floor), hence total ways is 5*5*5*5=5^4=625.   625nswer: 625.
<result>A</result>
Four persons enter the lift of a six storey building at the ground floor. In how many ways can they get out of lift on any floor other than ground floor