How to prove: A non-abelian finite group in which every subgroup is abelian has order divisible by at most two primes.

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    $\begingroup$ Every proper subgroup, you mean. $\endgroup$ – Asaf Karagila Jun 24 '14 at 0:49

This is the first "General result" provided by G.A Miller and H.C Moreno in the following paper available here



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