GMAT Sentence Correction (SC) | Re: Each of whom/Each of which/All of which/Many of Whom

Hello Experts,

Can you please explain the rules for the usage of following :

Each of whom
Each of which
All of which
Many of Whom
Each one of which
Many of which

Do they depend upon the subject they are tiedto?

mikemcgarry DmitryFarber