A tricky brainteaser has left some Reddit users scratching their heads. In a post uploaded this week, a user posted an image of a diagnal and horizontal line combinatorics. One of the basic problems ...

Counting will get you nowhere. Try a little combinatorics instead. By Kenneth Chang A couple of weeks ago, I wrote about a viral math problem — 8÷2(2+2) = ? — that drew the disdain of many ...

It involves just six matches, but this puzzle is anything but easy to solve. The Growing Triangles puzzle asks users to transform two triangles made from six matches into four triangles, by moving ...