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Mathematics for IGCSE & O level - Sets (Section 2 - No. 18)

If set A = {a, b, c} and set B = {d, e, f}, what is A ∩ B?
{a, b, c, d, e, f}
{ }
{a, b, c}
{d, e, f}

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The intersection of disjoint sets is empty.

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