Grant Member 453 Member For: 22y 1m 12d Location: Kurrajong, Sydney Posted 31/08/04 10:43 AM Share Posted 31/08/04 10:43 AM Of helping me out out here?Trying to help my girlfriend with her uni work but the days of maths were oh so long ago.Scenario:You have 100 balls and drop them randomly amongst five urns.What is the probablity ofa) 20, 20, 20, 20, 20b) 18, 19, 20, 21, 22Each number above represents the number of balls in each urn. N factorial is popping into my head for some reason but I really just can't remember what to do.Help is much appreciated!Grant Link to comment Share on other sites More sharing options...
xr6 typhoon Good for nothing member Donating Members 619 Member For: 20y 6m 20d Location: Sydney Posted 31/08/04 10:51 AM Share Posted 31/08/04 10:51 AM I'd leve the ball handling to your girlfriend :banghead: Link to comment Share on other sites More sharing options...
ducatijb Lifetime Members 3,448 Member For: 21y 9m 11d Gender: Male Location: sydney Posted 31/08/04 10:52 AM Share Posted 31/08/04 10:52 AM We'll have to summon Ken for this one Grant... :banghead: Link to comment Share on other sites More sharing options...
MISSXR Lifetime Members 623 Member For: 22y 18d Gender: Female Location: IN YOUR NIGHTMARES Posted 31/08/04 10:56 AM Share Posted 31/08/04 10:56 AM I found this somewhere: :banghead: Click Here - Interesting Link to comment Share on other sites More sharing options...
KEN 24T Gandalf the Grey, Maiar of Manwë and Varda, Team HgAg/Sneaky Member 7,371 Member For: 21y 6m 15d Gender: Male Location: The Shire, Middle Earth Posted 01/09/04 12:53 AM Share Posted 01/09/04 12:53 AM We'll have to summon Ken for this one Grant... If you say his name, he will appear. ... now ... 2+2=22 right? Link to comment Share on other sites More sharing options...
bcl Toughest BA Turbo Lifetime Members 3,408 Member For: 22y 21d Gender: Male Location: Sydney Posted 01/09/04 02:22 AM Share Posted 01/09/04 02:22 AM It’s been 30 years since combinatorial probability at Uni, so here goes my stab:1. (4!/(5**4)) ** 20 = (24/625) ** 20the alternative way is1 * ((4/5) **20) * ((3/5) **20) * ((2/5) ** 20) * ((1/5) ** 20) giving the same answer both ways2. ((4!/(5**4))**18) * ((4 * 3**2 * 2**3) / (5**20)I could be completely wrong, as those brain cells may no longer exist.Brian Link to comment Share on other sites More sharing options...
ktford FORD FORD FORD Donating Members 9,390 Member For: 21y 9m 28d Gender: Male Location: Victoria Point In Brissy's eastern side Posted 01/09/04 02:50 AM Share Posted 01/09/04 02:50 AM Um, get a GF that has finished Uni, does that help?Scotty Link to comment Share on other sites More sharing options...
Guest Guests Posted 01/09/04 04:02 AM Share Posted 01/09/04 04:02 AM WTF ,two terds in a dunnie,flush it,still two terds,dunnie still blocked :lol: gone,jobs done...simplevik Link to comment Share on other sites More sharing options...
KEN 24T Gandalf the Grey, Maiar of Manwë and Varda, Team HgAg/Sneaky Member 7,371 Member For: 21y 6m 15d Gender: Male Location: The Shire, Middle Earth Posted 01/09/04 06:28 AM Share Posted 01/09/04 06:28 AM It’s been 30 years since combinatorial probability at Uni, so here goes my stab:1. (4!/(5**4)) ** 20 = (24/625) ** 20the alternative way is1 * ((4/5) **20) * ((3/5) **20) * ((2/5) ** 20) * ((1/5) ** 20) giving the same answer both ways2. ((4!/(5**4))**18) * ((4 * 3**2 * 2**3) / (5**20)I could be completely wrong, as those brain cells may no longer exist.Brian You continue to amaze me Brian ... Link to comment Share on other sites More sharing options...
Grant Member 453 Member For: 22y 1m 12d Location: Kurrajong, Sydney Posted 01/09/04 08:36 AM Author Share Posted 01/09/04 08:36 AM Um, get a GF that has finished Uni, does that help?Scotty Mate, if you saw her you wouldn't be saying that Grant Link to comment Share on other sites More sharing options...
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