Statistics Question

Question

n(U) = 80, n(A) = 30, P(B) = .25 and n(A∩B) = 12. Determine n(A’υB).

Answer 1

n(U) = 80, n(A)=30, n(B) = 80-30=50 = n(A')

n(A'UB) = 50 as A' and B are the same

draw a Venn diagram