Question

Let A = {X:XEN X<5} B { x is a prime number less thang 9} find the (A-B)U(B-A)​

Answer 1

Answer:

A={X:XEN X<5}=>A={1,2,3,4}

B={x is a prime number less than 9}=>B={2,3,5,7}

Therefore, (A-B)U(B-A)=({1,2,3,4}-{2,3,5,7})U({2,3,5,7}-{1,2,3,4})={1,4}U{5,7}={1,4,5,7}.

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