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MathNet 2024-part-03 — 168 problems (EN–VI) Question 93

Math Olympiad Vault · MathNet 2024-part-03 — 168 problems (EN–VI)

Question 93

A four-digit number $\overline{ABBA}$ is defined as a *good number* if it is divisible by the two-digit number $\overline{BB}$. Given that the digits $A$ and $B$ are allowed to be the same, determine the total number of *good numbers*.