Question

if n(A)=2,then find n(P(A)=?

Answer 1

n(P(A))=2^n(A)
=2^2
=4

Answer 2

n×a = 2-------------------(1)
n×p×a.--------------------(2)
putting the values of n×a in equation (2).
then, 2×p =2p.
so, answer will be 2p.