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Find the smallest set A such that Auu{1,...

Find the smallest set `A` such that `Auu{1,2}={1,2,3,5,9}dot`

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Smallest set of Y has three elements and largest set of Y has five elements, since RHS set has five elements.
`therefore` Smallest set of Y is {3, 5, 9}
and largest set of Y is {1, 2, 3, 5, 9}.
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