What is the dimensional formula of $a b^{-1}$ in the equation $\left(\mathrm{P}+\frac{\mathrm{a}}{\mathrm{V}^2}\right)(\mathrm{V}-\mathrm{b})=\mathrm{RT}$, where letters have their usual meaning.
- [JEE MAIN 2024]
- A$\left[\mathrm{M}^6 \mathrm{~L}^3 \mathrm{~T}^{-2}\right]$
- B$\left[\mathrm{ML}^2 \mathrm{~T}^{-2}\right]$
- C$\left[M^{-1} L^5 T^3\right]$
- D$\left[M^6 L^7 T^4\right]$
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- [JEE MAIN 2019]