What is the dimensional formula of ab–1 in the equation , where letters have their usual meaning.

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Physics

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Question

What is the dimensional formula of ab^–1 in the equation $(P + \frac{a}{V^{2}}) (V - b) = RT$ , where letters have their usual meaning.

[M^–1L⁵T³]

[M⁶L⁷T⁴]

[ML²T^–2]

[M⁰L³T^–2]

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$[P] = [\frac{a}{V^{2}}]$

$[M_{1} L^{- 1} T^{- 2}] = \frac{a}{[L^{6}]}$

a = [M¹L⁵T^–2] and [V] = [b] = [L³]

$\frac{a}{b} = \frac{[M^{1} L^{5} T^{- 2}]}{[L^{3}]} = [M^{1} L^{2} T^{- 2}]$