Widening of gauge is provided if degree of thecurve, is

- 1
  
  $3^{o} o r l e s s$
- 2
  
  $3^{o} t o 4 {\frac{1}{2}}^{o}$
- 3
  
  $m o r e t h a n 4 {\frac{1}{2}}^{o}$
- 4
  
  none of these

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