Question

In n {a} =20,n [B] =50, n [AUB] =60 and n [B']=20 . find n[AuB]and n [U]​

Answer 1

Answer:

n(A∩B) = 10

n(U) = 70

Step-by-step explanation:

n(A∩B) =n(A)+n(B)−n(A∪B)

n(A∩B) =20+50–60

n(A∩B) = 10

Also n(B′) =n(U)−n(B)

So,

20=n(U)−50

n(U) =50+20

n(U) =70

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