The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force $6 t / c m^{2}$ , safe shear stress $5 k g / c m^{2}$ and B.M. 24 mt,

- 1
  
  is sfe in shear
- 2
  
  is unsfafe in shear
- 3
  
  is over safe in shear
- 4
  
  needs redesigning

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