If $$\dfrac{1}{\sqrt{4x+1}}\left\{ { \left( \dfrac { 1+\sqrt { 4x+1 }  }{ 2 }  \right)  }^{ n }-{ \left( \dfrac { 1-\sqrt { 4x+1 }  }{ 2 }  \right)  }^{ n } \right\} =a_{0}+a_{1}\ x+....a_{5}\ x^{5}$$, then $$n=$$
  • A
    $$11$$
  • B
    $$9$$
  • C
    $$10$$
  • D
    $$None\ of\ these$$

Solution