Question

Which of the following represents singleton set.
$\left(i\right)A=\{x:x$ is an even prime number$\}$
$\left(ii\right)y:y$ is a whole number which is not a natural number.
$\left(iii\right)x:x\in I,1<x\le 3$

• A. $\left(i\right)$ only
• B. $\left(ii\right)$ and $\left(iii\right)$
• C. $\left(i\right)$ and $\left(ii\right)$
• D. $\left(i\right),\left(ii\right)$ and $\left(iii\right)$

Answer 1

The correct option is C $\left(i\right)$ and $\left(ii\right)$

$\left(i\right)\left\{2\right\}$, singleton set

$\left(ii\right)\left\{0\right\}$, singleton set

$\left(iii\right)\{2,3\}$, not singleton set