The lever arm in a singly reinforced beam is equal to

- 1
  
  $\frac{d - n}{3}$
- 2
  
  $\frac{2 d - n}{3}$
- 3
  
  $\frac{3 d - n}{3}$
- 4
  
  $\frac{4 d - n}{3}$

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