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\subsection*Exercise 21 Prove that if $|G|=p^n$ for $p$ prime, then $Z(G)\neq 1$.
\documentclassarticle \begindocument
\subsection*Exercise 21 Prove that if $|G|=p^n$ for $p$ prime, then $Z(G)\neq 1$.
\documentclassarticle \begindocument