If A and B are two sets such that n(A)=7, n(B)=6 and A B , then the least possible value of n(A , ,B) is

JEE Main Mathematics question

If and are two sets such that , and , then the least possible value of is

Answer: (A)

. It is least when is largest, i.e. 6 (): .

Question ID VK-003130