A polynomial $f(x)$ of degree $n$ with real coefficients has roots $x_1, x_2, \ldots , x_n\ne1$ is such that $f(1)=-10$, $f'(1)=1$ and $f''(1)=6$.

Find $\displaystyle \sum_{i=1}^{n}\dfrac{1}{(1-x_i)^2}$.

$$ **Clarification**: $f'(x)$ and $f''(x)$ represents the first and second derivative of $f(x)$, respectively.

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