# Find the smallest set A such that A ∪ {1, 2} = {1, 2, 3, 5, 9}.

A {1, 2} = {1, 2, 3, 5, 9}

Elements of A and {1, 2} together give us the result

So smallest se of A can be

A = {1, 2, 3, 5, 9} – {1, 2}

A = {3, 5, 9}.

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RS Aggarwal - Mathematics