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 `S cap T` has 11 elements , how many elements does `S cup T` have ?

Verified by Experts

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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