Calculating Properties of Gas Mixture in 4L Flask

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Please can someone give me a solution of this problem?

One liter N2 at 2.1 bar and two liters of Ar at 3.4 bar are mixed in a 4L flask to form an ideal gas mixture. calculate the value of the final pressure of the mixture if the initial and final temperature of the gases are respectively 304 K and 402 K and the final one is 377 K.

Thank you!
 
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