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March 21st, 2015, 08:24 AM  #1 
Newbie Joined: Jan 2013 Posts: 12 Thanks: 0  Elements in commutator subgroup
We know that $G < \infty$ and $G:Z(G)^2 < G'$. Show that $G'$ contains elements which are not commutators. Can I get any hints? 

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commutator, elements, subgroup 
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