Replace 'less' with 'fewer'.
'Less' denotes 'in small degree'.
'Fewer' denotes 'number'.
The correct sentence should be:
No fewer than hundred audiences are sitting in the hall and waiting for the final performance.
e.g.
Use
fewer if you’re referring to people or things in the plural (e.g. houses, newspapers, dogs, students).
Use
less when you’re referring to something that can’t be counted or doesn’t have a plural. (e.g. money, air, time, music, rain).
| He devotes less time to his studies. |
| People want to spend less time in traffic jam. |
| There are no fewer than fifty boys in our class. |
| The workers roped no fewer than two hundred trees within ten hours. |
Use of Less and Lesser.Less means 'in a small degree'. It can be used as a noun, an adjective, and an adverb.
Lesser can be used as an adjective. As an adjective, it is a step further to less.
e.g.| My income is less than yours. (Adjective) |
| Chemistry is less difficult than biology. (Adverb) |
| Choose the lesser evil of the two. |
