If f(x)=1+nx+n(n−1)2x2+n(n−1)(n−2)6x3+⋯+xn, where n∈N, then – InterviewSolution

1.	If f(x)=1+nx+n(n−1)2x2+n(n−1)(n−2)6x3+⋯+xn, where n∈N, then f′′(1) is equal to
Answer» If $f (x) = 1 + n x + \frac{n (n - 1)}{2} x^{2} + \frac{n (n - 1) (n - 2)}{6} x^{3} + \dots + x^{n}$ , where $n \in N,$ then $f^{''} (1)$ is equal to

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