Question

If A = {1, 2, 3, 4}; B = {1, 2, 3, 5, 6} then find A ∩ B and B ∩ A. Are they equal?

Answer 1

$\bold{Answer :}$

The given two sets are

A = {1, 2, 3, 4} and B = {1, 2, 3, 5, 6}

So, A ∩ B
= {x : x belongs to both A and B}
= {1, 2, 3}

and B ∩ A
= {x : x belongs to both B and A}
= {1, 2, 3}

Therefore, A ∩ B = B ∩ A

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