Let's do a 5/10 half-size example. Good cards: 1,2,3,4,5 Bad cards: a,b,c,d,e
First card drawn is 1 Good cards left: 2,3,4,5 Bad cards left: a,b,c,d,e Total cards left: 9 Now, for your second draw, there are 4 good cards left, and 9 total cards, so the chances of the next card drawn being good is 4/9. Cards drawn: 1,2 Good cards left: 3,4,5 Bad cards left: a,b,c,d,e Total cards left: 8 Now, there are only 3 good cards left. The chances of the next draw being good is 3/8. Making more sense? --Ben Ian Skinner wrote: > I'm sorry, but this is just bouncing off of my thick skull and getting lost > in space. > > You've removed a "good" card from the possibilities. For the first one, > there are 10 good cards and 20 total. For the second, there are 9 good > cards and 19 total. And so forth. > > --Ben > > How have you removed a good card if this is being calculated before any cards > are drawn? Is this just the way of statistics? > > > -------------- > Ian Skinner > Web Programmer > BloodSource > www.BloodSource.org > Sacramento, CA > > "C code. C code run. Run code run. Please!" > - Cynthia Dunning > > > > ...-----Original Message----- > ...From: Ben Doom [mailto:[EMAIL PROTECTED] > ...Sent: Friday, January 14, 2005 12:29 PM > ...To: CF-Community > ...Subject: Re: Calculating odds. > ... > ...You've removed a "good" card from the possibilities. For the first one, > ...there are 10 good cards and 20 total. For the second, there are 9 good > ...cards and 19 total. And so forth. > ... > ...--Ben > ... > ...Ian Skinner wrote: > ...> Draw 5 numbers from Set B = 10/20 * 9/19 * 8/18 * 7/17 * 6/16. > ...> > ...> Ok, I was going 10/20 * 10/19 * 10/18 * 10/17 * 10/16. > ...> > ...> Can you refresh my very rusty statistics on why both the numerator and > ...denominator are reduced for each iteration? > ... > ... > ... > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Find out how CFTicket can increase your company's customer support efficiency by 100% http://www.houseoffusion.com/banners/view.cfm?bannerid=49 Message: http://www.houseoffusion.com/lists.cfm/link=i:5:142623 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/5 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:5 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.5 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54
