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) 10I got this question in a national level competition.My question is taken from Sets topic in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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

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) 10I got this question in a national level competition.My question is taken from Sets topic in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics
Answer» Correct CHOICE is (d) 10 Best explanation: N(A U B) = n(A) + n(B) – n(A ∩ B).

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