Divide this grid into four identical, nonoverlapping shapes along the square boundaries. Each shape must contain two of the same letters.
There are four different solutions, which differ only slightly from one another.
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This puzzle originally appeared in Spektrum der Wissenschaft and was reproduced with permission. …
A trio of tricky teasers Tanya Khovanova is a luminary of the recreational mathematics scene. She is one of its foremost bloggers and also runs Number Gossip , a site where you can sumbit a number and she “will tell you everything you want to know about it but were afraid to ask.” Tanya has now written her first book, Mathematical Puzzles and Curiosities, in collaboration with two other puzzle en…
I wrote a book. This is my first book, so I am very proud. I wrote it together with two brilliant puzzle lovers, Ivo Fagundes David de Oliveira and Yogev Shpilman. The book is published by World Scientific and is available for pre-order: Mathematical Puzzles and Curiosities. Here is one sample puzzle from the book. […]
In this post I’ll talk about another favorite recreational math puzzle, the (in)famous “Pentagon Problem”. First, though, I wanted to provide a solution to the Ghost Bugs problem from my last blog post. The puzzle is the following: You are given four lines in a plane in general position (no two parallel, no three intersecting […]
