If the actual observed value of standard penetration resistance, N, is greater than 15 in a fine sand layer below water table, then the equivalent penetration resistance will be

- 1
  
  $15 + [\frac{(N + 15)}{2}]$
- 2
  
  $15 - [\frac{(N + 15)}{2}]$
- 3
  
  $15 + [\frac{(N - 15)}{2}]$
- 4
  
  $15 + [\frac{(15 - N)}{2}]$

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