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3 moles of a mono-atomic gas (gamma= 5//...

3 moles of a mono-atomic gas `(gamma= 5//3)` is mixed with 1 mole of a diatomic gas `(gamma= 7//5)`. The value of `gamma` for the mixture will be

A

`9//11`

B

`11//7`

C

`12//7`

D

`15//7`

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