If x and y are two sets such that n(x)=17,n(y)=23and n(x union y)=38,find n(x universal y)

If x and y are two sets such that n(x)=17,n(y)=23and n(x union y)=38,f

1.	If x and y are two sets such that n(x)=17,n(y)=23and n(x union y)=38,find n(x universal y)
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