Question

if n(A)=20, n(B)=30 and n(A union B)=35 then what is A intersection B

Answer 1

Answer:

refer to the attachment

Answer 2

Answer:

related questions 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

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