Question

If n (A)=15,n (A-B)=10 , then find n (AUB) ?

Answer 1

Answer:n(B)+ 10

Step-by-step explanation:n(A)= 15

n(A-B)=10

Thus, n(AUB)=n(A)+n(B)-n(AintersectionB)

= 15+n(B) -n(A intersection B)

=15 +n(B)-5

=10+ n(B)

We need to know the value of n(B).

Answer 2

Step-by-step explanation:

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

n(AUB)1=10+n(b)