umask value for group users to get read, write and execute permissions

Question

what value have I to specify for umask that the group users get read, write and execute?

Answer 1

what value have I to specify for umask that the group users get read, write and execute?

That would be a 0 for the group. The umask value would then look something like:
002
Owner: rwx
Group: rwx
Others: r-x

Here is a good link on the matter.