Two persons enter the lift of a five storey building at the ground floor. In how many ways can they get out of lift on any floor other than ground floor  Choose one: A) 7 B) 10 C) 12 D) 14 E) 16
Each person out of 2 has 4 floors (options) to get out of (since no one gets out on the ground floor), hence total ways is 4*4=4^2=16.   Answer: 16.
<result>E</result>
Two persons enter the lift of a five storey building at the ground floor. In how many ways can they get out of lift on any floor other than ground floor