After 28 days, the cube strength of a grillage beam should not be less than

- 1
  
  $10 N / m m^{2}$
- 2
  
  $12 N / m m^{2}$
- 3
  
  $14 N / m m^{2}$
- 4
  
  $16 N / m m^{2}$

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