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william
New Member

Canada
1 Posts

 Posted - 01/27/2012 :  17:38:01 33 balls mumbered 1-33 in a bingo type dispenserlet two balls out to attain #1 then #2return the balls and repeat this operation until #1 then #2 are attainedrepeat the operation until this happens a second timeHow many tries are needed to achieve this? Edited by - royhaas on 01/30/2012 09:39:04

Ultraglide
Advanced Member

Canada
277 Posts

 Posted - 02/02/2012 :  18:19:01 What do you mean by attain? Do you mean obtain?

Ultraglide
Advanced Member

Canada
277 Posts

 Posted - 02/03/2012 :  17:27:33 I assume you are talking about drawing the balls numbered 1 and 2 without any respect to the order in which they are drawn. There are 33 ways to draw a ball out on the first draw and 32 ways to draw a second ball (assuming no replacement). Drawing a 1 and 2 is the same as drawing a 2 and 1 so that the number of cases are doubled, so just divide by 2. Now to the second part of your question, it appears that you are asking how many draws will take place before it happens again. It would seem to me that there is no way to determine this. I would welcome input from anyone else in this matter.
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