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? >
Get 20 slips of paper and write each unique number on a separate slip and put it into a bowl. YOu have 20/20. The chance to draw a "1" is 1/20. Now there is 19 slips in the bowl. Now let's say you draw the 1 and are asked to draw a "4". The chance to draw the "4" is 1/19 since there is 1 "4" and 19 slips of paper in. This is under the assumption that you can only draw each slip once which is why I asked distinct numbers etc before hand. The term draw usually means that each "slip" is a distinct outcome unless there is a slip with the same number on it. -- 2004 - The year $184M couldn't buy a pennant. Ron Artest: Extremely flawed, very accidental, semi-martyr ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Discover CFTicket - The leading ColdFusion Help Desk and Trouble Ticket application http://www.houseoffusion.com/banners/view.cfm?bannerid=48 Message: http://www.houseoffusion.com/lists.cfm/link=i:5:142594 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
