If we have three groups of people with 100 hundred people in each group, do we need to use "of"?
1) There are three hundreds of people in the street.
or
2) There are three hundreds people in the street.
Another context with the superlative adjective form.
3) I have seen more than three hundred of the happiest people in the street.
Am I correct to consider that "of" can't be omitted in sentence 3 because of "the happiest"?