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

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1.	If n(A)=20 and n(B)=30 and n(A U B) = 40 then n(A ∩ B) is?
A.	20
B.	30
C.	40
D.	10
Answer» E.

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