Question

If n(A) =15 n (B) = 9 n(A∩B) =4 find n(A U B)

Answer 1

Answer:

20

Step-by-step explanation:

n(A) only =15-4=11

n(B) only=9-4=5

n(A n B)=4

n(A U B)=11+5+4=20