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Mathematics for IGCSE & O level - Sets (Section 1 - No. 25)

If A = {1, 2, 3, 4} and B = {5, 6, 7}, what is A ∩ B?
{1, 2, 3, 4, 5, 6, 7}
{ }
{1, 2, 3, 4}
{5, 6, 7}

説明

The intersection of two disjoint sets is the empty set.

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