Question

if x and y are two sets such that n(X)=17,n(Y)=23 and n(XUY)=38 find X intersection Y

Answer 1

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Answer 2

n(X)=17
n(Y)=23
n(XUY)=38
X intersection Y = n(X) + n(Y) - n(XUY)
= 17 + 23 - 38
= 2