In an adiabatic process,the state of a gas is changed from $P_1, V_1, T_1$ to $P_2, V_2, T_2$. Out of the following relations,the correct one is
- A$T_1 V_1^{\gamma-1} = T_2 V_2^{\gamma-1}$
- B$P_1 T_1^{\gamma-1} = P_2 T_2^{\gamma-1}$
- C$T_1 V_1^{\gamma} = T_2 V_2^{\gamma}$
- D$P_1 V_1^{\gamma-1} = P_2 V_2^{\gamma-1}$
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