# The Indisputable Santa Mathematical Advent CalendarDay 24

Happy 24th of December!

Throughout the month, to accompany the release of our book on the Mathematics of ChristmasHannah Fry & I are tweeting out Christmathsy bits and pieces, one a day, advent calendar style. Assuming we don’t run out of ideas, that is…

And so, the final day of the Impossible Santa Mathematical Advent Calendar has arrived. Santa is about to set off, but there’s still time to take a quick register of the reindeer:

“Now, Dasher! Now, Dancer! Now, Prancer, and Vixen!
“On, Comet! On, Cupid! On, Donner and Blitzen!”*

But, wait a minute… Which one is which?

Answers via the comments or on Twitter. All correct answers will be rewarded with deep respect and warm Christmas wishes. Enjoy!

The solution to this puzzle will be posted tomorrow (Christmas!) with the solution to yesterday’s Dressing Room Disaster puzzles to follow on Boxing Day (mainly because the explanation of the solution is taking a while to write up!).

Merry Christmas everyone!

CLICK HERE TO SEE THE COMPLETE CALENDAR

* I was interested to learn that “Donner and Blitzen” were actually named “Dunder and Blixen” (or other variations thereof) in early versions of the text. I suppose the versions in Rudolph the Red-Nosed Reindeer must have ultimately overwhelmed these alternatives.

# The Indisputable Santa Mathematical Advent CalendarDay 23

Happy 23rd of December!

Throughout the month, to accompany the release of our book on the Mathematics of ChristmasHannah Fry & I are tweeting out Christmathsy bits and pieces, one a day, advent calendar style. Assuming we don’t run out of ideas, that is…

We’re getting to the business end of this advent calendar now and the puzzling is getting serious. High stakes stuff today, as Santa needs help getting into that iconic costume…

Two levels of challenge…

Merry:

And Mayhem!

(For the advanced puzzle, note that not every path starting and ending in A involves a complete circuit of the pole. For example, if Santa follows the path ABCDBA, he has not completed a circuit.)

Each time you enter a room, you MUST follow all of the instructions written there.

For extra credit, try to find Santa’s shortest possible path in each case. And for extra extra credit, prove that your path really is the shortest.

Answers via the comments or on Twitter. All correct answers will be rewarded with deep respect and warm Christmas wishes.

The answers for these two puzzles won’t be available until Boxing Day, so you have an extra couple of days to think about them.

And join us tomorrow for the final day of the Impossible Santa Mathematical Advent Calendar!

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# The Indisputable Santa Mathematical Advent CalendarDay 22

Happy 22nd of December!

Throughout the month, to accompany the release of our book on the Mathematics of ChristmasHannah Fry & I are tweeting out Christmathsy bits and pieces, one a day, advent calendar style. Assuming we don’t run out of ideas, that is…

You may remember from Day 10 that Santa is not all that good with passwords and security. Well…

Here’s the letter in copyable form:

05-06-02-19 20-02-15-21-02. 17-13-06-02-20-06 04-16-22-13-05 26-16-22 03-19-10-15-08 14-06 02 ~**MESSAGE~CORRUPTED**~ 6765-10946-8-233-233-1-10946-8-5 55-3-987-6765-1-34-8-5-4181-987-610. 10946-34-1-610-144 121393-987-17711. 1-1-4181-1 (1-21-8-5 8)

Answers via the comments or on Twitter. All correct answers will be rewarded with deep respect and warm Christmas wishes. Enjoy!

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# The Indisputable Santa Mathematical Advent CalendarDay 21

Happy 21st of December!

Throughout the month, to accompany the release of our book on the Mathematics of ChristmasHannah Fry & I are tweeting out Christmathsy bits and pieces, one a day, advent calendar style. Assuming we don’t run out of ideas, that is…

Today, we’re investigating a crime…

Answers via the comments or on Twitter. All correct answers will be rewarded with deep respect and warm Christmas wishes. Enjoy!

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# The Indisputable Santa Mathematical Advent CalendarDay 20

Happy 20th of December!

Throughout the month, to accompany the release of our book on the Mathematics of ChristmasHannah Fry & I are tweeting out Christmathsy bits and pieces, one a day, advent calendar style. Assuming we don’t run out of ideas, that is…

OK, since the upcoming final four puzzles of the calendar may be a little tough, today, some light relief…

Answers via the comments or on Twitter. All correct answers will be rewarded with deep respect and warm Christmas wishes. Enjoy!

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# The Indisputable Santa Mathematical Advent CalendarDay 19

Happy 19th of December!

Throughout the month, to accompany the release of our book on the Mathematics of ChristmasHannah Fry & I are tweeting out Christmathsy bits and pieces, one a day, advent calendar style. Assuming we don’t run out of ideas, that is…

Answers via the comments or on Twitter. All correct answers will be rewarded with deep respect and warm Christmas wishes. Enjoy!

CLICK HERE TO SEE THE WHOLE CALENDAR SO FAR

# The Indisputable Santa Mathematical Advent CalendarDay 18

Happy 18th of December!

Throughout the month, to accompany the release of our book on the Mathematics of ChristmasHannah Fry & I are tweeting out Christmathsy bits and pieces, one a day, advent calendar style. Assuming we don’t run out of ideas, that is…

Today’s puzzle has two levels of difficulty…

Fun:

… and Fiendish:

Answers via the comments or on Twitter. All correct answers will be rewarded with deep respect and warm Christmas wishes. Enjoy!

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# The Indisputable Santa Mathematical Advent CalendarDay 17

Happy 17th of December!

Throughout the month, to accompany the release of our book on the Mathematics of ChristmasHannah Fry & I are tweeting out Christmathsy bits and pieces, one a day, advent calendar style. Assuming we don’t run out of ideas, that is…

The lyrics were created using the same Markov model used to generate the Queen’s tweets. How many of the nine Christmas songs can you identify?

Answers via the comments or on Twitter. All correct answers will be rewarded with deep respect and warm Christmas wishes. Enjoy!

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# The Indisputable Santa Mathematical Advent CalendarDay 16

Happy 16th of December!

Throughout the month, to accompany the release of our book on the Mathematics of ChristmasHannah Fry & I are tweeting out Christmathsy bits and pieces, one a day, advent calendar style. Assuming we don’t run out of ideas, that is…

Today, we’re drawing inspiration from the great Only Connect (sort of…):

To interpret the pictures, remember it’s a Christmas quiz…

Answers via the comments or on Twitter. All correct answers will be rewarded with deep respect and warm Christmas wishes. Enjoy!

CLICK HERE TO SEE THE WHOLE CALENDAR SO FAR

# The Indisputable Santa Mathematical Advent CalendarDay 15

Happy 15th of December!

Throughout the month, to accompany the release of our book on the Mathematics of ChristmasHannah Fry & I are tweeting out Christmathsy bits and pieces, one a day, advent calendar style. Assuming we don’t run out of ideas, that is…

Today, I’m afraid there’s bad news for your seasonal transport business…

Answers via the comments or on Twitter. All correct answers will be rewarded with deep respect and warm Christmas wishes. Enjoy!

CLICK HERE TO SEE THE WHOLE CALENDAR SO FAR