Question

If BCA, n (A) = 20, n (B) = 12, then the value of n (A-B)
is --
A) 20
B) 12
C) 8
D) 32​

Answer 1

Answer:

8

Step-by-step explanation:

As given in the question and shown in the figure attached, B is a subset of A.

Therefore, all the elements of B are elements of a.

A - B means that all the elements of A that are in B will get removed.

Here, since B lies in A, n(B) = 12 elements will be removed.

Hence the answer is 20 - 12 = 8