The consistency index is given by

[where $w_{P}$ = Plastic limit, $l_{P}$ = Plasticity index, $w_{L}$ = Liquid limit, and w= Natural water content of a soil]

- 1
  
  $\frac{w_{P} - w}{l_{P}}$
- 2
  
  $\frac{w_{L} - w}{l_{P}}$
- 3
  
  $\frac{w_{L} - w_{P}}{l_{P}}$
- 4
  
  $\frac{w - w_{P}}{l_{P}}$

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