Question

n(A)=8,n(B)=12,n(AuB)=15,n(B')=?​

Answer 1

Answer:

n(B)' = 3

Step-by-step explanation:

we have given,

n (A) =8 , n (B)12., n (AuB)=15

n(B)' = n (AuB)- n (B)

n(B)' = 15 - 12

n(B)' = 3