यदि ${x_n} = \frac{{1 - 2 + 3 - 4 + 5 - 6 + \dots - 2n}}{{\sqrt {{n^2} + 1} + \sqrt {4{n^2} - 1} }},$ है,तो $\mathop {\lim }\limits_{n \to \infty } {x_n}$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{3}$
  • B
    $-\frac{1}{3}$
  • C
    $\frac{2}{3}$
  • D
    $1$

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