What is the set of counting number less than 10?

The set of counting numbers less than 10 is:

{9, 8, 7, 6, 5, 4, 3, 2, 1}

Counting numbers are whole integers starting from 1 and going to infinity. It doesn't include negative numbers or zero.

Therefore, the set would be:

{1, 2, 3, 4, 5, 6, 7, 8, 9}