How does equality 7-2521 serve his society when he works with the group as a street sweeper ? How does he serve his society when he works as an individual ? Which is more beneficial to society !

Equality obviously cleans streets. Aside from street cleaning, he serves society in that he represents his group collective hence strengthening the ideology in this dystopia, When Equality works as an individual (discovering electricity) , he breaks the darkness of collectivism. In the long run however, he is helping society by bringing light, literally and figuratively, to man kind. This society needs to be torn down and built up again. Equality will begin this process simply by being an individual.