How do we go about finding the number of elements of a cyclic subgroup that's generated by an element in the main group. For example:(adsbygoogle = window.adsbygoogle || []).push({});

The subgroup Z_{30}generated by 25.

I would think this subgroup would be {0,1,5,25} but there's supposed to be 6 elements and not four. Whats going on?

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# Finding the number of elements in a cyclic group

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