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Mathematics for IGCSE & O level - Sets (Section 3 - No. 38)
If A ⊆ B, which of the following is ALWAYS true?
B ⊆ A
A ∪ B = A
A ∩ B = B
A ∪ B = B
Uitleg
If A is a subset of B, their union is equal to B.
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