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The equation of state of some gases can be expressed as `(P+ (a)/(V^(2)))(V-b)= RT`, where P is the pressure, V is the volume, T is the absolute temperature and a, b & R are constants. The dimensions of 'a' are : -

A

`[MLT^-1]`

B

`[ML^5T^-2]`

C

`[L^-3]`

D

`[L^6]`

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