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Question -

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



Answer -

A тИк {1, 2} = {1, 2, 3, 5, 9}
Elements of A and {1, 2} together give us the result
So smallest set of A can be
A = {1, 2, 3, 5, 9} тАУ {1, 2}
A = {3, 5, 9}

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