If the breadth of a singly reinforced beam is b, effective depth is d, depth of neutral axis below the top of beam is n and the compressive stress in the extreme fiber of concrete is $σ_{c b}$ then the moment of resistance of the beam is equal to

- 1
  
  $\frac{σ_{c b}}{2} x b n (\frac{d - n}{3})$
- 2
  
  $\frac{σ_{c b}}{2} x b n (\frac{2 d - n}{3})$
- 3
  
  $\frac{σ_{c b}}{2} x b n (\frac{3 d - n}{3})$
- 4
  
  $\frac{σ_{c b}}{2} x b n (\frac{4 d - n}{3})$

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