Question 78
Evaluate the infinite sum
$$
\sum_{n=0}^{\infty} \binom{2 n}{n} \frac{1}{5^{n}}
$$
$$
\sum_{n=0}^{\infty} \binom{2 n}{n} \frac{1}{5^{n}}
$$
MathNet 2008-part-05 — 164 problems (EN–VI) Question 78
Math Olympiad Vault · MathNet 2008-part-05 — 164 problems (EN–VI)