Question

State which of the following are null or empty set?

The set of women army chief in India since $1947$

Answer 1

A set that contains no member is called the empty set. It is also called the null set.

It is denoted by $\left\{\right\}$or $\phi$

Given set:

The set of women army chiefs in India since $1947$

As we know there is no women army chief in India since $1947$, the given set contains no element.

Hence, the set of women army chief in India since $1947$ is Null or empty set.