@Gupta731
in that link they given for SIMPLE ABELIAN GROUP...NOT FOR ABELIAN GROUP
what is differnce in abelian and simple abelian
If order of group is prime ====> Group is cyclic ====> Group is abelian
This is one way only
..in one of prev question it is taken group of order P^2 is abelian ...is it generalize to P^k