Question

State which of the following are null or empty set?

The set of teacher teaching you.

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 teacher teaching you.

There are more than $1$ teacher teaching us in the school.

Therefore, the set of teacher teaching you contains more than $1$ member in the set.

Hence, The set of teacher teaching you is not a Null or empty set.