Question 114
Show that $\underbrace{66\dots6}_{61}\underbrace{11\dots1}_{61}$ is divisible by $61$.
(Nursoltan Khavalbolot)
(Nursoltan Khavalbolot)
MathNet 2025-part-01 — 187 problems (EN–VI) Question 114
Math Olympiad Vault · MathNet 2025-part-01 — 187 problems (EN–VI)