Question

If X and Y are two sets such that n ( X ) = 17, n ( Y ) = 23 and n ( X ∪ Y ) = 38, find n ( X ∩ Y ).
NCERT Solutions for Class 11th Mathematics Chapter 1 Exercise 1.6 1

Answer 1

n(X intersection y)=n(X)+n(Y)-n(XUY) =>17+23-38 =>40-38 =>2