Question

If n(U)=70, n(A)=25, n(B)=30, n(A∩B)=5, then n(A∪B)' is

A)5 B)10 C)15 D)20​

Answer 1

Step-by-step explanation:

n (AUB) = n (A) + n (B) - n (A intersection B )

= 25 + 30 - 5

= 55 - 5

n ( AUB) = 50

n (AUB)' = U - n(AUB)

n (AUB)' = 70 - 50 = 20