
Just looking for the criteria which I would use to say if these groups are cyclic.
Like a short proof? for (i), (ii), (iii), (iv) (v)
Thank you.

Just looking for the criteria which I would use to say if these groups are cyclic.
Like a short proof? for (i), (ii), (iii), (iv) (v)
Thank you.
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A group is cyclic if there exists a single element in the group which generates the entire group. Your first group only has 27 elements, is there an element in there which generates the entire group?