Give me an equation :D

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vxi
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Give me an equation :D

Post by vxi » Wed Jul 17, 2013 11:38 am

Hey guys,
So, I've been interested in chances for just about my whole life. Mostly chances involving dice, because I'm getting more and more interested in board games and gambling, and that sort of thing. Just as a hobby, not as a job or anything like that.
Here's what I came up with while thinking about a 20 sided die:

(We'll call the final result r)
Roll the die once, check the number (We'll call this number a)
Roll the die a second time, check the number (Well call this number b)
If ba, r = b.
Else, r = a + b.

What I want from you guys is an equation that can give me the chance of every r (from 1 to 39) where I plug in 1-39 to get the chance (as a decimal).
Or you could just list out all of the chances, but that might take a little longer.
Also, I'd love it if you showed your work. It's always interesting to see how different people solve these problems.
Thanks for reading! ^_^
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Re: Give me an equation :D

Post by Ian7 » Wed Jul 17, 2013 1:08 pm

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I missed my physiology class and had to teach myself that equation and what everything meant.
NOW THAT'S AN EQUATION.
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vxi
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Re: Give me an equation :D

Post by vxi » Wed Jul 17, 2013 3:42 pm

Wow. For some reason I figured people would be interested in helping me out with this ._.
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Re: Give me an equation :D

Post by Joejoe347 » Wed Jul 17, 2013 6:10 pm

math is hard
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Re: Give me an equation :D

Post by Tony Wong » Wed Jul 17, 2013 6:51 pm

E = MC²
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Re: Give me an equation :D

Post by Struan » Wed Jul 17, 2013 7:31 pm

f'(x) = lim (f(x+h)-f(x))/h = lim (sin(x+h)sin x)/h

Higher Mathematics Fuck yeah.
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Re: Give me an equation :D

Post by Dr. Fisch » Wed Jul 17, 2013 8:13 pm

decided to kill some time at work
the best i can figure it is

if r > 20
P(r) = (10-ceil(abs(21-r)/2))/400

if r ≤ 20
P(r) = (10-ceil(abs(21-r)/2) + r)/400

i didnt bother figuring out how to get rid of the conditional
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vxi
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Re: Give me an equation :D

Post by vxi » Wed Jul 17, 2013 11:37 pm

Alright, so just to be sure, if I'm using 34 I'd do...
P(34) = (10-ceil(abs(21-34)/2))/400
P(34) = (10-ceil((13)/2))/400
P(34) = (10-7)/400
P(34) = 0.0075 or 0.75% chance
That looks pretty sound to me, if I did it right... I hope I did :P
Did I?
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Re: Give me an equation :D

Post by Dr. Fisch » Thu Jul 18, 2013 12:20 am

as far as i can figure
yes
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Re: Give me an equation :D

Post by vxi » Thu Jul 18, 2013 12:30 am

Awesome.
If it works properly, thanks for the help.
I'll check later if all of the chances add up to 100%.
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Re: Give me an equation :D

Post by Dr. Fisch » Thu Jul 18, 2013 7:23 am

400 possible cases
210 if b ≥ a
190 if a > b
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Re: Give me an equation :D

Post by TheKing » Wed Jul 24, 2013 1:37 am

Ian7 wrote:Image
I missed my physiology class and had to teach myself that equation and what everything meant.
NOW THAT'S AN EQUATION.
I work at a membrane caustic chemical plant with these chemical species. This made me smile.
edit: I also enjoyed taking A&P
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Re: Give me an equation :D

Post by Ian7 » Wed Jul 24, 2013 9:23 am

TheKing wrote:
Ian7 wrote:Image
I missed my physiology class and had to teach myself that equation and what everything meant.
NOW THAT'S AN EQUATION.
I work at a membrane caustic chemical plant with these chemical species. This made me smile.
edit: I also enjoyed taking A&P
Funny part is, even though the Goldman equation was on his power-point he only wants us to know the Nerst equation.
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Re: Give me an equation :D

Post by narwal » Wed Jul 24, 2013 12:19 pm

2 + d = 10
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Re: Give me an equation :D

Post by DiabeticDugong » Wed Jul 24, 2013 3:55 pm

aaaaaannnddd its math well might as well to be true there was actually some one who made a small computer of some sort that will cheat/tell you where the ball will land ( by ball i am referring to the game where u have a spinning platform and you drop the ball in it and u bet where the ball will stop) the man tried it once and in las vagas and for most of the night and i worked. all he had to do was to put in the required information into the machine and it would tell him. Best part it fit in his ankle in order to hid it from the cops.
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