The minimum cube stength of concrete used for a prestressed member, is

- 1
  
  $50 k g / c m^{2}$
- 2
  
  $150 k g / c m^{2}$
- 3
  
  $150 k g / c m^{2}$
- 4
  
  $350 k g / c m^{2}$

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