Question

Identify the following as null set or singleton set.

$\mathrm{C}=\{\mathrm{x}:\mathrm{x}\mathrm{is}\mathrm{a}\mathrm{composite}\mathrm{number}\mathrm{greator}\mathrm{then}2\mathrm{and}\mathrm{less}\mathrm{then}4\}$

Answer 1

We know that A set having only one element is called a Null or singleton set.

A set not having any element is called a null set.

Here set $\mathrm{C}=\{\mathrm{Empty}\mathrm{set}\}$ has no element

Hence the given set is the null set.