If the load, warping and frictional stresses in a cement concrete slab are $210 N / m m^{2}$ , $290 N / m m^{2}$ and $10 N / m m^{2}$ respectively, the critical combination of stresses during summer midday is -

- 1
  
  $290 N / m m^{2}$
- 2
  
  $390 N / m m^{2}$
- 3
  
  $490 N / m m^{2}$
- 4
  
  $590 N / m m^{2}$

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