If σ_cb is the permissible stress in compression due to bending in concrete in N/mm², the moduler ratio (m) is of the order of

- 1
  
  $\frac{280}{3 σ_{c b}}$
- 2
  
  $\frac{280}{4 . σ_{c b}}$
- 3
  
  19
- 4
  
  23

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