Question

if A={m,n,o,p} and B={p,q,r,s} find 1 AUB 2 AnB 3 B-A
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Answer 1

Step-by-step explanation:

Answer

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