Which one of the following specifications of precast concrete pile is incorrect?

- 1
  
  the concrete mix 1 : 2 : 4 or 1 : 1 1/2 : 3
- 2
  
  the size may be 25 to 60 cm
- 3
  
  the leghth may be for 3 metres to 30 metres
- 4
  
  none of these

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