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In the given figure the if n(A)=20,n(U)=50,n(C)=10 and n(A∩B)=5 then n(B)=?

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In the given figure the if n(A)=20,n(U)=50,n(C)=10 and n(A∩B)=5 then n(B)=?

(a) 35

(b) 20

(c) 30

(d) 10

The question was asked in homework.

I need to ask this question from Sets topic in portion Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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The correct choice is (a) 35

The explanation is: Here n(B)= n(U) – n(A) + n(A∩B).

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