How many different non-isomorphic Abelian groups of order 4 are there
(A) 2
(B) 3
(C) 4
(D) 5
Answer: (A)
Explanation:
2 can be written as 2 power 2.
Number of partitioning of 2 = no. of non isomorphic
abelian groups
2 can be partitioned as {(2),(1,1)}