Question

Cardinal number of the set A = {x : x is an even prime number} is ____ .

• A. 0
• B. 2
• C. 1
• D. Infinite

Answer 1

The correct option is C

1

We know that 2 is the only even prime number.

$\Rightarrow A=\left\{2\right\}$

$\Rightarrow n\left(A\right)=1$
$\therefore$ cardinality of the set A is 1.