Three samples of the same gas A,B and C ...

Three samples of the same gas A,B and C `(gamma=3//2)` have initially equal volume. Now the volume of each sample is doubled. The process is adiabatic for A. Isobaric for B and isothermal for C. If the final pressures are equal for all three samples, find the ratio of their initial pressures

`2sqrt2:2:1`

`2sqrt2:1:2`

`sqrt2:1:2`

`2:1:sqrt2`

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