Question

If n(A)= 10, n(B) = 5 and n(A n B) = 7 then find n(A UB).​

Answer 1

Answer:

n (AUB ) = n (a) + n ( b ) - n (a n b )

10 +5 -7

= 15 - 7

= 8 Ans

Answer 2

Step-by-step explanation:

n(A∪B)=n(A)+n(B)−n(A∩B)−−−−−−−(1)

Given n(A)=7

n(B)=9

n(A∪B)=14

Substituting in 1

14=7+9−n(A∩B)

⇒n(A∩B)=16−14=2