What's actually the difference between Delirium and Sanity? Honestly, please, think about it and then come back to me...
mardi 4 avril 2006
dimanche 26 février 2006
Enigme - La calculatrice
Le nombre formé par ses 2 premiers chiffres est le triple de celui formé par ses 2 derniers. Ecrit sur une calculatrice, ce nombre devient le nom d'une fleur, lorsque l'on retrourne la calculatrice.
Les 2 premières lettres du nom de cette fleur constituent un nombre écrit en chiffres romains qui n'est autre que celui formé par les 2 premiers chiffres du nombre recherché. Quel est ce nombre ?
Les 2 premières lettres du nom de cette fleur constituent un nombre écrit en chiffres romains qui n'est autre que celui formé par les 2 premiers chiffres du nombre recherché. Quel est ce nombre ?
jeudi 23 février 2006
mercredi 15 février 2006
dimanche 12 février 2006
dimanche 22 janvier 2006
dimanche 8 janvier 2006
samedi 7 janvier 2006
Ten elves and a witch
Ten elves have been taken from Elfland by an evil witch. Worse still, the witch is planning to turn some of them into frogs.
But the witch isn't all bad: she gives the elves a chance.
The witch lines up all ten of the elves in single file, so that the elf at the back can see nine other elves in front of him, the next elf has eight other elves in front of him, and so on. The elf at the front can see no other elves.
The witch has a large number of hats in her wardrobe. Some are black and some are white, but there is no necessarily the same number of black hats as white hats. The witch randomly places a hat on each elf's head. The elf at the back can see nine elves with hats in front of him, the next elf eight, and so on. No elf can see his own hat.
The witch then takes out her magic wand and asks the elf at the back; "What color is your hat?" If the elf answers correctly, he will go free; if not, he is turned into a frog. The witch continues along the line saying the same thing. The elves can only say 'white' or 'black', and cannot add other information (by changing the pitch of their voice, for example).
The elves have been allowed to meet with you beforehand, and plan a strategy to save as many of them as possible. What do you tell the elves to do, and how many can you guarantee to save?
But the witch isn't all bad: she gives the elves a chance.
The witch lines up all ten of the elves in single file, so that the elf at the back can see nine other elves in front of him, the next elf has eight other elves in front of him, and so on. The elf at the front can see no other elves.
The witch has a large number of hats in her wardrobe. Some are black and some are white, but there is no necessarily the same number of black hats as white hats. The witch randomly places a hat on each elf's head. The elf at the back can see nine elves with hats in front of him, the next elf eight, and so on. No elf can see his own hat.
The witch then takes out her magic wand and asks the elf at the back; "What color is your hat?" If the elf answers correctly, he will go free; if not, he is turned into a frog. The witch continues along the line saying the same thing. The elves can only say 'white' or 'black', and cannot add other information (by changing the pitch of their voice, for example).
The elves have been allowed to meet with you beforehand, and plan a strategy to save as many of them as possible. What do you tell the elves to do, and how many can you guarantee to save?
vendredi 30 décembre 2005
mercredi 28 décembre 2005
Goldbach's conjecture
Goldbach's conjecture asserts that all positive even integers greater or equal to 4 can be expressed as the sum of two primes.
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