A group of order one is the trivial group containing one element. The trivial group can be {0} under addition or {1} under multiplication.
a)the trivial group is a cyclic group as it can be generated by the identity element.
b)the trivial group is a an abelian group because all cyclic groups are abelian.
c) the trivial group does not have subgroup .
d) There is only one unique group of order 1 up to isomorphism which is the trivial group.
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