In this project, You assigned one of the below proofs:
1. Suppose B is a set and {Ai|i ∈ I } is an indexed family of sets with I ≠ Φ. Prove that B\(Ui∈IAi) = ∩i∈I(B\Ai).
Write a formal proof.
The purpose of the assignment is to demonstrate your problem solving and proof skills and the relationship between the two.