Question

if n(a)=6 n(b)=25 n(aub) =35 then n(anb)
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Answer 1

Answer:

n(A∪B)=n(A)+n(B)−n(A∩B)−−−−−−−(1)

Given n(A)=6

n(B)=25

n(A∪B)=35

Substituting in 1

35=6+25−n(A∩B)

⇒n(A∩B)=31-35= -4