For any two sets A and B, A ⊆ B (A is a subset of B) if and only if:

For all x, if x ∈ A, then x ∈ B.

For all x, if x ∈ B, then x ∈ A.

There exists an x such that x ∈ A and x ∉ B.

Ac ⊆ Bc, where Ac and Bc are the complements of A and B, respectively.

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For any two sets A and B, A ⊆ B (A is a subset of B) if... | Mathematics MCQ #53 | Examora | Examora