If there are n pipes of same diameter d laid in parallel in place of a single pipe of diameter D, then -

- 1
  
  $d = \frac{D}{n^{2 / 5}}$
- 2
  
  $D = \frac{d}{n^{2 / 5}}$
- 3
  
  $d = \frac{D}{n^{2 / 3}}$
- 4
  
  $d = \frac{D}{n^{1 / 3}}$

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