I am in dire need of help! is an abelian group under multiplication mod . If you need more information, please let me know.

1) Find an element of maximal order in .

2) Let and be integers with and . Prove that

3) Let and be positive integers.

(a) Determine the number of elements of order in .

(b) Compute

Thanks for any and all help! I need help with these by tomorrow night, thanks