The cube strength of the concrete used for pre-stressed member should not be less than

- 1
  
  10 N/ $m m^{2}$
- 2
  
  25 N/ $m m^{2}$
- 3
  
  35 N/ $m m^{2}$
- 4
  
  50 N/ $m m^{2}$

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