Given that A and B are sets such that n(A)=8,n(B)=12 and n (A n B)=3 find n(A n B)
To find the value of n(A n B), you need to know the number of elements in the intersection of sets A and B. In this case, n(A n B) is given as 3.
The notation n(X) represents the cardinality or the number of elements in set X. Therefore, n(A) = 8 represents that set A contains 8 elements, and n(B) = 12 represents that set B contains 12 elements.
In this case, you are given that n(A n B) = 3, which means the intersection of sets A and B contains 3 elements. In other words, there are 3 elements that are common to both set A and set B.
So, the value of n(A n B) is 3.