A simply supported beam with rectangular cross-section is subjected to a central concentrated load. If the width and depth of the beam are doubled, then the deflection at the centre of the beam will be reduced to

- 1
  
  50°?_°
- 2
  
  25°?_°
- 3
  
  12.5°?_°
- 4
  
  6.25°?_°

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