Which one is grammatically correct or better? I have two assignments, one of them is done. I have two assignments, one of which is done.

How one and one's is different from other indefinite pronouns the possessive of one (one's) is formed the same way as the possessive of other indefinite pronouns, such as someone (someone's), but it is … Both a/an and one mean one. The difference is that one puts more emphasis on the number such as i have 4 computers and a printer/i have 4 computers and only one printer.