Ian Skinner wrote:
> I am panning the general high intelligence of this group.
>
> Say you have a set of 10 numbers that is a subset of a set of 20.
>
> If you where to draw 5 numbers from the set of twenty, but can only draw any
> given number once, what are the odds of all 5 numbers picked being in the set
> of 10?
>
Distinct numbers? You have to be more specific.
Set A {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20}
Set B {1,2,3,4,5,6,7,8,9,10}
Draw 5 numbers from Set B = 10/20 * 9/19 * 8/18 * 7/17 * 6/16.
> My quick answer was .5^5 = 0.03125, or 1 in 32, but I realized those odds
> would only apply if you could pick any number in all the draws, so you could
> have {1 1 1 1 1}, right?
>
> My second guess was that it might be 1/2*10/19*5/9*10/17*5/6 =
> 0.071666093337919963306960210984979, or ~1 in 14, but is that correct? Or
> does whether a previous draw is in the subset of 10 or not matter?
>
> This unfortunately exhausted my current knowledge of statistics it just has
> been way too many years/decades.
>
>
> --------------
> Ian Skinner
> Web Programmer
> BloodSource
> www.BloodSource.org
> Sacramento, CA
>
> "C code. C code run. Run code run. Please!"
> - Cynthia Dunning
>
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