Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than

- 1
  
  35 MPa and 42 MPa
- 2
  
  42 MPa and 35 MPa
- 3
  
  42 MPa and 53 MPa
- 4
  
  53 MPa and 42 MPa

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