If S and T are two sets such that S has...

If S and T are two sets such that S has 21 elements, T has 32 elements, and `Snn T`has 11 elements, how many elements does `Suu T`have?

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Given
`n(S)`=`21`, `n(T)`=`32`, `n(SnnT)`=`11`
we know that:
`n(SuuT)`=`n(S)+n(T)-n(SnnT)`
...

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