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