mscroggs.co.uk
mscroggs.co.uk

subscribe

Blog

 2017-12-18 

Christmas card 2017

Showing all comments about the post Christmas card 2017. To return to the blog post, click here.

Comments

Comments in green were written by me. Comments in blue were not written by me.
@Jose: There is a mistake in your answer: 243 (0100000) is the number of numbers between 10,000 and 100,000 that do not contain the digits 0, 1, 2, 3, 4, 5, or 6.
Matthew
                 Reply
Thanks for the puzzle!
Is it possible that the question 9 is no correct?
I get a penguin with perfect simetrie except at answer 9 : 0100000 that breaks the simetry.
Is it correct or a mistake in my answer?
Thx
Jose
                 Reply
@C: look up something called Frobenius numbers. This problem's equivalent to finding the Frobenius number for 14 and 29.
Lewis
                 Reply
I can solve #2 with code, but is there a tidy maths way to solve it directly?
C
                 Reply
My efforts were flightless.
NHH
                 Reply
What a fun diversion! I have to admit I can't remember how to solve #2 - I finally had to write some code. (So primitive.)
Heather
                 Reply
@Matthew: Thank you for the clarification!

I don't want to spoil the answer for anyone, but my Christmassy picture looks like a well dressed bird.
Claudio
                 Reply
@Claudio: The page number at the end of the book is 116.
Matthew
                 Reply
Is that a book with 116 2 sided sheets, or is the page number at the end of the book 116?
Claudio
                 Reply
@HH: Nope, I mean questions 6, 7 and 8. The question refers to itself.
Matthew
                 Reply
For question 8, don't you mean "questions 6 and 7"?
HH
                 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 "kite" in the box below (case sensitive):

Archive

Show me a random blog post
 2020 

May 2020

A surprising fact about quadrilaterals
Interesting tautologies

Mar 2020

Log-scaled axes

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

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

Archive

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