If A and B are two sets such that n (A È B) = 36, n(A Ç B) = 16 and n(A ~ B) = 15, then n(B) is equal to

If A and B are two sets such that n (A È B) = 36, n(A�

1.	If A and B are two sets such that n (A È B) = 36, n(A Ç B) = 16 and n(A ~ B) = 15, then n(B) is equal to
A.	21
B.	31
C.	20
D.	52
Answer» B. 31

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