in a rainforced concrete column, the cross sectional area of steel bar is $A_{s}$ and that of concrete is $A_{c}$ The equivalent area of the section in terms of concrete is equal to

- 1
  
  $A_{s} + m A_{c}$
- 2
  
  $A_{c} + m A_{s}$
- 3
  
  $A_{s} - m A_{c}$
- 4
  
  $A_{c} - m A_{s}$

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