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Mathematics for IGCSE & O level - Sets (Section 3 - No. 13)

If A = {x | x is a letter in the word 'apple'} and B = {x | x is a letter in the word 'banana'}, then A ∩ B = ?
{a, p}
{a, b, e, n}
{p}
{}

설명

A = {a, p, l, e} and B = {b, a, n}. A ∩ B = {a}

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