- A subgroup of \( \mathbb{Z}/20\mathbb{Z} \) is generated by a divisor of 20. The divisors of 20 are 1, 2, 4, 5, 10, and 20.
- Non-trivial subgroups are those that are not the trivial group \(\{0\}\) or the entire group \(\mathbb{Z}/20\mathbb{Z}\).
- Two
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