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If A and B two sets containing 3 and 6 elements respectively and if minimum no. elements and max no. of elements in `AuuB` is p, q respectively then p+q is

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If all the elements of set A are different than set `B`.
Then the maximum no. of elements in set `AuuB` will be `6+3=9`.
If however, Set` A` is a subset of `B`, then the total number of elements in set `AuuB` will be `n(B)=6`.
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