Considering the gases to be ideal, the value of $\gamma = \frac{{{C_P}}}{{{C_V}}}$ for a gaseous mixture consisting of $= 3$ moles of carbon dioxide and $2$ moles of oxygen will be $({\gamma _{{O_2}}} = 1.4,\,\,{\gamma _{C{O_2}}} = 1.3)$
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