Hamdi Douss
Location Tunis - Tunisia
Activity
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Hamdi Douss replied to Eden Mabee
If you have a symmetric pattern, like just a line from the center to the edge of the triangle, this is normal. You only have a different pattern if you turn the flexagon upside down. However, if you'll write different letters or different symbols, you'll get different patterns, you'll see the letters turn around. Try to flex your flexagon without rotating the...
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Hamdi Douss made a comment
It is not clear what the definition of a state is. But if I try to not turn the flexagon while cycling between faces (so I don't induce a state forward manually), I think I got 6 states for each face.
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Hamdi Douss replied to Hamdi Douss
@SylviaO'Mahony you had the same error as mine: the diagonal going from upper left to bottom right has the number '4' twice
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Hamdi Douss replied to Hamdi Douss
Thanks for all! That's true. I don't know why I just checked the diagonal from upper right to bottom left and not the other.
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Hamdi Douss made a comment
Is this another valid solution for the Latin square?
1 7 4 5 2 3 6
6 3 1 2 5 7 4
3 2 6 7 4 1 5
4 5 2 3 7 6 1
7 6 5 4 1 2 3
5 1 7 6 3 4 2
2 4 3 1 6 5 7 -
Hamdi Douss replied to Ana Stasia
@YossiElran Even after editing, it is still wrong (I think). The only thing that can make Issac the mistake maker is that Abraham did not write any part. Else, If Abraham 1st statement is true (Issac is the mistake maker), that makes his 2nd statement false, and thus he wrote that wrong part of the essay.
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Hamdi Douss made a comment
I think the explanation on Question 4 is wrong: "Correct! He could be diurnal and asleep (and lying) or nocturnal and awake (and telling the truth)." -> should be "Correct! He could be diurnal and asleep (and lying) or nocturnal and asleep (and telling the truth)."
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Hamdi Douss replied to Carole C
@JanDeurwaarder 2 boys, 2 girls, 6 pennies to get 6 buns and 1 penny to get 2 buns -> 8 buns, 2 for each of the kids.
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Hamdi Douss replied to Carole C
I find a solution with 2 boys and 2 girls, so I think the answers given in the email are not unique.
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Hamdi Douss replied to Jo B
@JanDeurwaarder This is a substitution encoding, but not a simple shift, it is more subtle than that..subtle like a mirror!
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Hamdi Douss replied to Jo B
@JanDeurwaarder Why? I solved it! (about @JoB code)
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Hamdi Douss made a comment
AMNKY RGUJN SYSFO GUSGK HANBC ZNEGT YFRPV MSRZV HNQEV KCBDQ Q.
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Hamdi Douss replied to Jo B
ZYHLOFGVOB!
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Hamdi Douss made a comment
It would have been nice to know in advance that the number of trials we could make on an exercice is limited. Ideally, the number of trials in each exercice is displayed.
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Hamdi Douss made a comment
What are the motivations behind the fact to have one encoding for left-hand digits, and another for the right-hand ones?
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Hamdi Douss replied to Hamdi Douss
@YossiElran Absolutely. I missed that. Thanks for the reply.
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Hamdi Douss made a comment
The solving approach in the video made these assumptions/guessing: K=1, and O=7. A more formal approach would be: K is 1 or 2. 5th column: 4*4=16, so O is 6, 7, 8 or 9 (the remainder is utmost 3), and the remainder for the last column is necessarily 1 => K*4+1=J. So J is 5 or 9. Now, let's take the 2nd column: J*4. Given O > 6, the remainder from the first...
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Hamdi Douss replied to Ruby Howard
Anyone else googled "cyclic number" after reading @RubyHoward comment?
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Hamdi Douss made a comment
For the question 1, quiz in 1.17 activity: DOPEY+DOPEY=GRUMPY. I came up with another solution: 93210+93210=186420. Is it also correct or am I missing something?
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Hamdi Douss made a comment
I did not know about "divisible by 11" rule! Awesome!
