Question

When A = Φ, then number of elements in P(A) is ______.

Answer 1

When A = Φ, then number of elements in P(A) is 1.

Explanation:

Given: A = ϕ

To find: n[P(A)]

A = ϕ 

⇒ n(A) = 0

P(A) is a power set and number of elements in power set is 2^x where x is number of elements in set A

Therefore,

n[P(A)] = 2⁰ 

= 1