Here, $P$ is the pressure, $V$ is the volume, $n$ is the number of moles, $R$ is the gas constant, and $T$ is the temperature. For constant volume, the ratio of $P_2$ to $P_1$ is given by $T_2$ to $T_1$. So, $P_2 = P_1 \cdot \frac{T_2}{T_1}$.
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