If $f(x) = 1 + nx + \frac{n(n-1)}{2}x^2 + \frac{n(n-1)(n-2)}{6}x^3 + \ldots + x^n$, then $f''(1) =$

Question

$n(n-1)2^n$

$n(n-1)2^{n-1}$

$(n-1)2^{n-1}$

$n(n-1)2^{n-2}$

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