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 2017-12-18 

Christmas card 2017

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Comments

Comments in green were written by me. Comments in blue were not written by me.
 2019-01-04 
@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.
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Matthew
 2019-01-04 
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
Reply
Jose
 2018-01-01 
@C: look up something called Frobenius numbers. This problem's equivalent to finding the Frobenius number for 14 and 29.
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Lewis
 2017-12-28 
I can solve #2 with code, but is there a tidy maths way to solve it directly?
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C
 2017-12-23 
My efforts were flightless.
Reply
NHH
 2017-12-20 
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.)
Reply
Heather
 2017-12-19 
@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.
Reply
Claudio
 2017-12-19 
@Claudio: The page number at the end of the book is 116.
Reply
Matthew
 2017-12-19 
Is that a book with 116 2 sided sheets, or is the page number at the end of the book 116?
Reply
Claudio
 2017-12-19 
@HH: Nope, I mean questions 6, 7 and 8. The question refers to itself.
Reply
Matthew
 2017-12-19 
For question 8, don't you mean "questions 6 and 7"?
Reply
HH
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