(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

If G is a finite group that has exactly one subgroup H of a given order, then H is normal.

2. Relevant equations

N/A

3. The attempt at a solution

I cannot figure out what makes a subgroup H special if it is the only one of a given order...

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# Homework Help: Proving H is normal

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