Pick up the incorrect statement from the following. In double reinforced beams,

- 1
  
  steel is provided both on tension and compression sides
- 2
  
  the moment of resistance is the sum of limiting resistance of singly reinforced section and the additional moment given by compression steel
- 3
  
  the moment of resistance is the sum of limiting resistance of singly reinforced section, the addition moment given by compression steel and extra tensile steel
- 4
  
  none of these

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