# Monthly Archives: December 2010

## 12 Days of Christmas

Nice problem and solution at squarecirclez about counting the total number of presents. Triangular numbers appears! It seems that this year’s Simpsons Christmas special was a live action parody/tribute to Sesame Street and the Muppets. It had them singing the … Continue reading

In the midst of grading exams now. One problem consists of computing determinants and many students give the answer $(1+a)^3 -3a -1$ without simplifying it to $a^3+3a^2$. I have this nagging suspicion that they are not … Continue reading