If n(A)=20 and n(B)=30 and n(A U B) = 40 then n(A ∩ B) is?

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answerhappygod
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If n(A)=20 and n(B)=30 and n(A U B) = 40 then n(A ∩ B) is?

Post by answerhappygod »

a) 20
b) 30
c) 40
d) 10
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