Yes. You can choose any subset of the number of keys you like.
Isn't there any maximum limit for total number of cosigners?
As you know, electrum allow increasing the number of consigners up to 15. Isn't that the maximum number of cosigners we can have or that's just a limit enforced by electrum?
If I am not wrong, the p2sh script size can't be more than 520 bytes and that should limit the total number of cosigners we can have in a multi-signature address.