Question

.
If n(A) = 15, n(
AB)
= =
= 8 and n(AUB) = 19, then n(B) =
A) 7
B) 8
C) 9
D) 12​

Answer 1

Step-by-step explanation:

n(A)=15

n(B)=?

n(AUB)=19

n(AΠB)=8

n(AUB)=n(A)+n(B)-n(AΠB)

19=15+n(B)-8

19=7+n(B)

19-7=n(B)

12= n(B)

Here, n(B)=12