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MathNet 2008-part-04 — 165 problems (EN–VI) Question 51

Math Olympiad Vault · MathNet 2008-part-04 — 165 problems (EN–VI)

Question 51

Compute the sum $2\left[h\left(\frac{1}{2009}\right)+h\left(\frac{2}{2009}\right)+\ldots+h\left(\frac{2008}{2009}\right)\right]$, where
$$
h(t)=\frac{5}{5+25^{t}}, \quad t \in \mathbb{R}
$$