Question

09. If BCA then n(ANB) is
a) n(A - B)
b) n(B)
c) n(B - A)
d) n(A)​

Answer 1

Answer:

A ) n (A-B)

I hope it is useful

Answer 2

We need to recall the following definitions.

• $A$ will be a subset of $B$ if and only if all the elements of a set $A$ are present in $B$.
• The intersection of sets for two given sets is the set that contains all the elements that are common to both sets.

Given:

$B\subset A$

Since $B$ is a subset of $A$.

Then, all the elements of a ser $B$ are present in a set $A$.

From the definition of the intersection of sets, we get

$A\cap B=B$

⇒ $n(A\cap B)=n(B)$

Hence, the correct option is b) $n(B)$.