If X and Y are two sets such that n (X)...

If X and Y are two sets such that `n (X)=17, n (Y)= 23` and `n (Xuu Y)= 38` find `n (X nnY)` .

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`n(X uu Y)=n(X)+n(Y)-n(XnnY)`
`38=17+23-n(XnnY)`
`n(XnnY)=40-38=2`.

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