Question

If n(A)=10 n(B)=8 n(AnB)=3 then find the
n(AuB)

Answer 1

Answer:

15

Step-by-step explanation:

n(A∩B)=n(A)+n(B)−n(A∪B)−−−−−−−(1)

Given n(A)=10

n(B)=8

n(A∩B)=3

Substituting in 1

3=10+8−n(A∪B)

⇒n(A∪B)=18−3=15

Answer 2

Answer:

A = 10

B = 8

AnB = 18

but we want - intersection

so 18 - 3 = 15