If the pressure on a clay layer increases slightly from p to p+ $δ$ p and the void ratio decreases from $e_{0}$ to e, then the coefficient of compressibility is given by

- 1
  
  e/p
- 2
  
  $\frac{e_{0}}{δ p}$
- 3
  
  $\frac{e}{δ p}$
- 4
  
  $\frac{e_{0} - e}{δ p}$

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