Assume that P(A) = P(B) then show that A = B

In this video I have explained how to prove that A = B if it's given that P(A) = P(B)

Concepts used in this video
1. Power Set
Power Set of a given set means a set containing all possible subsets of given set.
So if A = {1, 2} then it's Power Set P(A) = {{1}, {2}, {1, 2}, ϕ}

2. A ⊂ B and B ⊂ A
Means that A = B

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