Sa se arate ca in calendarul curent ziua \( 13 \) a unei luni va pica cel mai des vineri.
Observatie. Calendarul curent are perioada de \( 400 \) de ani. Fiecare al \( 4 \)-lea an are \( 366 \) zile, cu exceptia anilor \( 100, 200, 300 \), modulo \( 400 \).
Probabilitate originala (AMM)
Moderators: Laurian Filip, Filip Chindea, maky, Cosmin Pohoata
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Filip Chindea
- Newton
- Posts: 324
- Joined: Thu Sep 27, 2007 9:01 pm
- Location: Bucharest
Probabilitate originala (AMM)
Last edited by Filip Chindea on Fri Jun 13, 2008 9:29 pm, edited 2 times in total.
Life is complex: it has real and imaginary components.
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pohoatza
Absolut genial. Nu stiam lucrul asta. Tocmai am citit 2 articole cu solutii asupra acestei probleme si mi se par extraordinare. Acestea sunt:
1) To prove that the 13th day of the month is more likely to be a friday than any other day of the week, S.R.Baxter, Mathematical Gazette, 1969.
2) Friday 13th, J.O.Irwin, Mathematical Gazette, 1971.
O sa le atasez pe forum imediat dupa ce upload-ul va fi posibil.
[Edit: Apropo de ce zice Cezar, asta e postul #13 al meu
]
1) To prove that the 13th day of the month is more likely to be a friday than any other day of the week, S.R.Baxter, Mathematical Gazette, 1969.
2) Friday 13th, J.O.Irwin, Mathematical Gazette, 1971.
O sa le atasez pe forum imediat dupa ce upload-ul va fi posibil.
[Edit: Apropo de ce zice Cezar, asta e postul #13 al meu
]
Last edited by pohoatza on Fri Sep 28, 2007 8:32 pm, edited 2 times in total.
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Cezar Lupu
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Da, intr-adevar. Si mie mi se pare absolut genial. Asta imi aminteste de filmul ala horror, Friday the 13 . 
An infinite number of mathematicians walk into a bar. The first one orders a beer. The second orders half a beer. The third, a quarter of a beer. The bartender says “You’re all idiots”, and pours two beers.
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Filip Chindea
- Newton
- Posts: 324
- Joined: Thu Sep 27, 2007 9:01 pm
- Location: Bucharest
Eu am gasit-o ca aplicatie la articolul
Generating Functions, Milan Novakovic, Training materials, The IMO Compendium Group (2007).
(Pentru a-l download-a gratuit click aici.)
Generating Functions, Milan Novakovic, Training materials, The IMO Compendium Group (2007).
(Pentru a-l download-a gratuit click aici.)
Life is complex: it has real and imaginary components.