Mathematics for IGCSE & O level - Sets (Section 2 - No. 38)

If A ⊆ B, and x ∈ A, then which of the following MUST be true?

x ∉ B

x ∈ B

x ∈ A'

x ∉ A'

설명

If A ⊆ B, then all elements of A are also elements of B. If x ∈ A, then x ∈ B.

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