If $δ$ P is the maximum probable deviation of actual value from the computed value of strength P and $δ$ F is the maximum probable deviation of actual value from the computed value of internal load F, then the minimum factor of safety is equal to

- 1
  
  $\frac{1 + δ P / P}{1 - δ F / F}$
- 2
  
  $\frac{1 - δ F / F}{1 + δ P / P}$
- 3
  
  $\frac{1 + δ F / F}{1 - δ P / P}$
- 4
  
  $\frac{1 - δ P / P}{1 + δ F / F}$

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