No. of elements in Power set

Let A = {phi, {phi}, {phi, {phi}}}, B = {{phi}, { {phi}}} . If m denotes the number of elements in power set of A and n denotes the number of elements in power set of B, then 2log_(n)m has the value equal to -

Write the number of elements in the power set of null set.

The number of elements in the power set of the set {{a,b},c} is

If the number of elements in the power set of set A is 128 then find the number of elements in the set A .

If the set A contains 5 elements, then the number of elements in the power set P(A) is equal to

Two finite sets have m and n elements. The number of elements in the power set of first set is 48 more than the total number of elements in the power set of the second set. Then the value of m and n are-

Which of the following cannot be the number of elements in the power set of any finite set ?