1 mole of a gas with gamma = (7)/(...

1 mole of a gas with `gamma = (7)/(5)` is mixed with 1 mole of gas with `gamma = (5)/(3 )` , then value of `gamma` of the resulting mixture is

`(7)/(5)`

`(2 )/(5 )`

`(3 )/(2 )`

`(12)/(7)`

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