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Main => General Board => Topic started by: Mr J on April 03, 2009, 08:27:55 PM

Title: Math Question
Post by: Mr J on April 03, 2009, 08:27:55 PM
I hope I ask this correctly. (38 numbers) what are the chances that I choose ANY two numbers and BOTH of those numbers end up being the furthest back unhit. Meaning, I start crossing off every hit number until I have two left and it just so happens its the two I pre-chose. Ken
Title: Re: Math Question
Post by: RoulettePlayer on April 03, 2009, 09:30:54 PM
Mr. J,
Firstly, I hope this is a hypothetical question and that you didn't loose one of your long progressions.
The way you've worded it, I'm not sure that I'm giving you what you want.  It might require KFS or =, if indeed he has an equal. 

chances of 2 numbers hitting in 1 spin    5.26%
I think this is the answer to your question, but ?


other info

chances of 2 numbers hitting at least once in 2 spins 10.25%
                                                             10        41.76%
                                                             38        87.19%
                                                             50        93.30%
                                                             75        98.27%
                                                           100        99.55%       


RP
               
Title: Re: Math Question
Post by: Mr J on April 03, 2009, 09:35:56 PM
Lets say I choose any two numbers, the 4 and the 31. I then start crossing off numbers as they hit until only TWO are left unhit. The 4 and the 31 just so happen to be the last two. What are the chances of this happening?  Ken
Title: Re: Math Question
Post by: madupz4 on April 03, 2009, 10:05:00 PM
Quote from: Mr J on April 03, 2009, 09:35:56 PM
Lets say I choose any two numbers, the 4 and the 31. I then start crossing off numbers as they hit until only TWO are left unhit. The 4 and the 31 just so happen to be the last two. What are the chances of this happening?  Ken

To state the obvious, I would say, "SLIM to NONE!"
Title: Re: Math Question
Post by: hoper35 on April 03, 2009, 10:15:51 PM
I think it's the same % as them being the first two numbers spun?   2 x 1 / 38 x 37

I think you can ignore duplicates.

Ron.