Three insulated vessels of equal volumes $V$ are connected by thin tubes that can transfer gas but do not transfer heat . Initially all vessels are filled with the same type of gas at a temperature $T_0$ ad pressure $P_0$ Then the temperature is the first vessel is doubled and the temperature in second vessel is tripled . The temperature in the third vessel remains unchanged . Find the final pressure $P^{\prime }$ in the system in terms of the initial pressure $P_0$ . 

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