File:Jet sans limite valeur.png
Jet_sans_limite_valeur.png (610 × 461 pixels, file size: 4 KB, MIME type: image/png)
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Summary
[edit]Probabilité de faire une valeur avec un « jet sans limite » sur 1d20 :
- une valeur entre 2 et 19 est gardée telle quelle ;
- si l'on tire un 20, on rejoue le dé et on ajoute le résultat ; si le résultat est à nouveau 20, on recommence…
- si l'on tire un 1, on retire un dé et on retranche le résultat ; si le deuxième jet est un 20, on retire un dé et on le retranche…
Certains résultats ne peuvent pas sortir (comme -19, 1, 20, 40…), leur probabilité est donc nulle. Dans une tranche de dix-neuf valeurs, la probabilité est la même, de la forme (0,05n)×100 où n est le numéro de la tranche.
Tracé avec Scilab.
Probability to have a value with an "open ended" d20 :
- if the value ranges between 2 and 19, it is kept;
- if the value is 20, the die is thrown again and the result is added; when the new result is also 20, play it again etc.
- if the value is 1, the die is thrown again and the result is subtracted; when the second result is 20, the die is thrown again and subtracted etc.
Some values can never be obtained (e.g. -19, 1, 20, 40, tec.), their probability is thus zero. In a set of nineteen values, the probability is the same, equal to (0.05n)×100 where n is the number of the set.
Drawn with Scilab.
Auteur/author : Christophe Dang Ngoc Chan (cdang)
Licensing
[edit]Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
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current | 14:56, 3 October 2005 | 610 × 461 (4 KB) | Cdang (talk | contribs) | Probabilité de faire une valeur avec un « jet sans limite » sur 1d20 : * une valeur entre 2 et 19 est gardée telle quelle ; * si l'on tire un 20, on rejoue le dé et on ajoute le résultat ; si le résultat est à nouveau 20, on recommence&h |
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