Consider the following statements:

1. uniformity coefficient greater than 6.

2. coefficient of curvature between 1 and 3

3. effective size greater than 1 mm

Of these statements

- 1
  
  1, 2 and 3 are correct
- 2
  
  1 and 2 are correct
- 3
  
  2 and 3 are correct
- 4
  
  1 and 3 are correct

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