Question

Let A and B be two subsets of U such that n (A)=7, n (B)=5, n (A intersection B)=0 and n [(AUB)]'=4. find. a: n(B)' ​

Answer 1

Answer: 11

Step-by-step explanation:

n(A) = 7

n(B) = 5

n(A ∩ B) = 0

n{(A U B)]' = 4

To find = n(B)'

Sol. :-

n(A U B) = 12

U = 12+ 4

U = 16

n(B)' = 16-5

n(B)' = 11