# Question -4

Calculus Level 3

If $$f(x)=\displaystyle \sum_{a=1}^n \left( x-\frac{1}{a} \right) \cdot \left( x-\frac{1}{a+1} \right)$$, then find the value of $\displaystyle \lim_{n \to \infty} f(0)$

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