જો $(1+x)^n = a_0 + a_1 x + a_2 x^2 + \ldots + a_n x^n$ અને $a_0 - a_2 + a_4 - a_6 + \ldots = k \cos \frac{n \pi}{4}$ હોય,તો $k = $

  • A
    $2^n$
  • B
    $2^{2n}$
  • C
    $\frac{2^n}{2}$
  • D
    $2^{\frac{n}{2}}$

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