Which of the following quantities is dimensionless ?

[F= force, $ρ$ = density, $μ$ = dynamic viscosity, $M^{1} L^{- 1} T^{- 1}$ = dimensions of dynamic viscosity]

- 1
  
  $\frac{ρ F}{μ}$
- 2
  
  $\frac{μ^{2} ρ}{F}$
- 3
  
  $\frac{ρ F}{μ^{2}}$
- 4
  
  $\frac{μ}{ρ^{2} F}$

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