Let ${a_1},{a_2},{a_3}, \ldots $. be in an A.P. such that $\sum\limits_{k = 1}^{12} {{a_{2k - 1}}} = - \frac{{72}}{5}{a_1},{a_1} \ne 0$. If $\sum\limits_{k = 1}^n {{a_k}} = 0$, then n is :
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