i think two more abelian groups are possible .
1 and 3 are given ,2 and 4 also exist .if i m wrong let me know ,thank you.
Please explain what is isomorphic group..i have seen this for many times but haven't studied about it..
MiNiPanda added the answer below
Is group theory given in Rosen Prateek Raghuvanshi ? I never found it . :(. Can you plz tell me the edition exactly or the reference for reading group theory. Thanks
Pawan Kumar 2 It's in Indian edition
Thanks brother Mk Utkarsh
Isomorphism : A group homomorphism that is bijective.
We proved that all 3 groups are homomorphic as well as isomorphic.
Note: I rearranged the elements of table to show the similarities between all 3 tables.