यदि $f(x)=1+nx+\frac{n(n-1)}{2}x^2+\frac{n(n-1)(n-2)}{6}x^3+\ldots+x^n$ है,तो $f''(1)$ का मान क्या होगा?

  • A
    $n(n-1)2^{n-2}$
  • B
    $n(n-1)2^n$
  • C
    $2^{n-1}$
  • D
    $(n-1)2^{n-1}$

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