mscroggs.co.uk
mscroggs.co.uk

subscribe

Blog

Christmas (2017) is coming!

 2017-11-28 
This year, the front page of mscroggs.co.uk will once again feature an advent calendar, just like last year and the year before. Behind each door, there will be a puzzle with a three digit solution. The solution to each day's puzzle forms part of a logic puzzle:
It's nearly Christmas and something terrible has happened: Santa and his two elves have been cursed! The curse has led Santa to forget which present three children—Alex, Ben and Carol—want and where they live.
The elves can still remember everything about Alex, Ben and Carol, but the curse is causing them to lie. One of the elves will lie on even numbered days and tell the truth on odd numbered days; the other elf will lie on odd numbered days and tell the truth on even numbered days. As is common in elf culture, each elf wears the same coloured clothes every day.
Each child lives in a different place and wants a different present. (But a present may be equal to a home.) The homes and presents are each represented by a number from 1 to 9.
Santa has called on you to help him work out the details he has forgotten. Behind each day (except Christmas Day), there is a puzzle with a three-digit answer. Each of these answers forms part of a fact that one of the elves tells you. You must work out which combination of clothes each elf wears, which one lies on each day, then put all the clues together to work out which presents need delivering to Alex, Ben and Carol, and where to deliver them.
Ten randomly selected people who solve all the puzzles and submit their answers to the logic puzzle using the form behind the door on the 25th will win prizes! A selection of the prizes are shown below, and will be added to throughout December.
The ten winners will also will one of these winners' medals:
As you solve the puzzles, your answers will be stored. This year, there is a new feature allowing you to synchronise your answers between multiple computers: simply enter your email address below the calendar, and you will be emailed a magic link to visit on your other devices.
Behind the door on Christmas Day, there will be a form allowing you to submit your answers. The winner will be randomly chosen from all those who submit the correct answer before the end of 2017. Each day's puzzle (and the entry form on Christmas Day) will be available from 5:00am GMT. But as the winners will be selected randomly, there's no need to get up at 5am on Christmas Day to enter!
To win a prize, you must submit your entry before the end of 2017. Only one entry will be accepted per person. If you have any questions, ask them in the comments below or on Twitter.
So once December is here, get solving! Good luck and have a very merry Christmas!

Similar posts

Christmas (2019) is coming!
Christmas (2018) is over
Christmas (2018) is coming!
Christmas (2017) is over

Comments

Comments in green were written by me. Comments in blue were not written by me.
@neal (@zbvif): Thanks, I've added a clarification to 22
Matthew
                 Reply
Me again

Just for info (clarification?): I read question on 22nd as
22 is two times an odd number. Today's number is the mean of all the answers, on days (including today), that are two times an odd number."

Note my added commas. I was averaging the answers, not the dates. Certainly ambiguous as far as I am concerned.
Only fixed it by 'cheating'. Trying best guessses of averages until I got the correct one.
neal (@zbvif)
                 Reply
Wow. Just discovered I meisread 15th Dec puzzle.

I can tell you that the number of combinations of n As and Bs which contain at at least one uninterrupted sequence of 3 As is 2^n - F3(n+3) where F3 is the fibonaccia variant adding 3 numbers (1,1,2,4,7,13,24 etc.).
Only took me about 8 hours (with some small help form OEIS for the 2 As problem)
Neal (@zbvif)
                 Reply
@Alex: Assume the pancake is 2D
Matthew
                 Reply
With todays puzzle does the pancake have any thickness i.e can we slice the pancake into 2 circular pancakes each with half the thickness or are we to assume its 2D
Alex
                 Reply
 Add a Comment 


I will only use your email address to reply to your comment (if a reply is needed).

Allowed HTML tags: <br> <a> <small> <b> <i> <s> <sup> <sub> <u> <spoiler> <ul> <ol> <li>
To prove you are not a spam bot, please type "sexa" backwards in the box below (case sensitive):

Archive

Show me a random blog post
 2020 

Feb 2020

PhD thesis, chapter ∞
PhD thesis, chapter 5
PhD thesis, chapter 4
PhD thesis, chapter 3
Inverting a matrix
PhD thesis, chapter 2

Jan 2020

PhD thesis, chapter 1
Gaussian elimination
Matrix multiplication
Christmas (2019) is over
 2019 
▼ show ▼
 2018 
▼ show ▼
 2017 
▼ show ▼
 2016 
▼ show ▼
 2015 
▼ show ▼
 2014 
▼ show ▼
 2013 
▼ show ▼
 2012 
▼ show ▼

Tags

gerry anderson mathslogicbot video games bodmas trigonometry london underground captain scarlet countdown dataset big internet math-off the aperiodical go raspberry pi bempp tennis pizza cutting chebyshev flexagons data london python mathsteroids simultaneous equations coins fractals latex manchester folding paper wave scattering interpolation platonic solids ucl world cup curvature gaussian elimination sound signorini conditions christmas harriss spiral noughts and crosses ternary books electromagnetic field nine men's morris asteroids puzzles people maths radio 4 game of life manchester science festival boundary element methods phd geometry graph theory talking maths in public matrix multiplication logic cross stitch hexapawn cambridge estimation rugby data visualisation a gamut of games binary tmip realhats machine learning map projections weak imposition palindromes royal institution statistics golden ratio oeis twitter misleading statistics wool hats final fantasy polynomials plastic ratio stickers chalkdust magazine probability news menace christmas card draughts approximation golden spiral sorting light reuleaux polygons royal baby craft triangles computational complexity accuracy advent calendar braiding weather station matt parker pac-man javascript inline code games inverse matrices rhombicuboctahedron matrix of cofactors european cup sobolev spaces mathsjam frobel matrices preconditioning dates reddit game show probability folding tube maps sport martin gardner dragon curves arithmetic error bars national lottery bubble bobble php pythagoras chess football hannah fry speed propositional calculus determinants numerical analysis programming finite element method matrix of minors

Archive

Show me a random blog post
▼ show ▼
© Matthew Scroggs 2012–2020