Question

If n( AUB) = 40 and n( A) =36,n(B)=10,n(A')=27
,n(AnB)=6 then find n(u)

Answer 1

Answer:

n ( A') = 27 { except A elements}

n (u) = all elements

we know that n (A')= n( u) - n (A)

27= n ( u) - 36

n(u)= 27+36= 63.