If A - B = ϕ, then which of the option is correct?

Question

Question

Answer 1

Concept:

Difference of two Sets: Let A and B be two sets then A – B = {x : x ∈ A and x∉ B}

Calculation:

Given that: A - B = ϕ

As we know that, if A and B are two sets then A – B = {x : x ∈ A and x∉ B}

So, if A - B = ϕ it means that all elements of A are also present in B.

As we know that, if all the elements of A are present in B then A ⊂ B

Hence, option 2 is correct.