There's a problem in Herstein which goes as:

> 
> If $G$ is abelian and if $N$ is a subgroup of $G$ prove that $G/N$ is abelian.
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> 
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I think there's a typo for there's no mention that $N$ is normal in $G$ or is there a interpretation for $G/N$ when $N\leq G$ is arbitrary?