## It’s Monday Math Madness time! (contest #3)

We've completed two Monday Math Madness contests. Last Friday Blinkdagger announced that Joshua Zucker, director at Julia Robinson Mathematics Festival, was randomly selected as the winner of the 2nd contest. Now it's my turn to post a contest problem. Those of you who are astute readers may have noticed that I said the contest would be held the 1st and 3rd Mondays of the month and today is actually the 5th Monday of March. Well, there's enough enthusiasm about this contest so we'll just do it every other week. So, we'll do 26 contests per year rather than 24. We're nice that way!

For this next few contests we've got a new prize! Techno Source was kind enough to donate several electronic Rubik's Revolution games to this cause. The cube has six really fun games that test your memory and reflex. I'll mail one of these cubes to the winner, with one caveat: If you live outside of the United States and the postage is prohibitive then I reserve the right to email you a $10 Amazon.com gift certificate instead.

Ok, now for the contest problem. Sixteen is my favorite number so this puzzle has to do with the number 16:

Prove or disprove: Every year (in our current Gregorian calendar) has a Friday the 16th. Don't forget leap years.

Here are the rules for the contest:

1. Email your answers with solutions to mondaymathmadness at gmail dot com.

2. Only one entry per person.

3. Each person may only win one prize per 12 month period.

3. Answer must be explained. You must show your work! Wild About Math! and Blinkdagger will be the final judges on whether an answer was properly explained or not.

4. The deadline to submit answers is Tuesday, April 8, 2008, 12:01AM, Pacific Time. (That's Tuesday morning, not Tuesday night.)

5. The winner will be chosen randomly from all well-explained and correct submissions, using a random number generator.

6. The winner will be announced Friday, April 11, 2008.

7. The winner will receive either a Rubik's Revolution toy or a 10 dollar gift certificate to Amazon.com!

8. Comments for this post should only be used to clarify the problem. Please do not discuss ANY potential solutions.

LaReneApril 1st, 2008 - 14:58

A contest with Math. I wish Math was something that I could get excited about. I find it fascinating to listen to people talk about their passion for it.

For me growing up, I found it to be miserable. Yet as an adult, I can see the value and wished I could go back to understand the laws that govern math. I have found it even fun at times.In my youth, I would’ve bet that I would never feel that way.