Four persons enter the lift of a four storey building at the ground floor. In how many ways can they get out of lift on any floor other than ground floor	Options.
A) 81
B) 129
C) 154
D) 182
E) 250
Each person out of 4 has 3 floors (options) to get out of (since no one gets out on the ground floor), hence total ways is 3*3*3*3=3^4=81.   81nswer: 81.
<result>A</result>
Four persons enter the lift of a four storey building at the ground floor. In how many ways can they get out of lift on any floor other than ground floor