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In the country of Sopcraenne, there are \(n\,(\ge 61)\) airports built recently such that the distances between any two airports are all different from one another.

A plane will ...

Paul has two identical ceiling fans \(A\) and \(B\) in a room. He generally uses fan \(A\) while fan \(B\) remains switched off. After some months of use, which fan ...

To prevent an epidemic outbreak, all the inhabitants of a city are tested for a virus. The whole population can be divided into the subsets

This is the first edition of Left to the Reader - a monthly problem-solving blog written by the Brilliant team, including open-ended challenges for the community to solve and discuss. While ...

Let \\(m\_r\\\) be the reflection of \\(m\\\). For example, \\( 1234\_r = 4321 \\\).

The positive integer k has the property,

\...

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