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:

alhabbibi answer is D32

Answer 2

If BCA, n (A) = 20, n (B) = 12, then the value of n (A-B)

is --

C) 8

First of all, we try to see what B⊂A means.

It signifies that B is a subset of A. Or, in other words, the elements which are present in B are also present in A.

n(A-B) means the number of elements which are present in A but not in B.

If we subtract the number of elements of B from that of A, we will get n(A-B).

It is given that, n(A) = 20

Again, n(B) = 12

So, n(A-B) = n(A) - n(B) = 20 - 12 = 8

Thus option (C) is correct.