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	Math Help Forum > University Math Help > Discrete Mathematics, Set Theory and Logic help on permutaion & combination User Name Save? Password Register Forum Rules FAQ Donate Members List Arcade Download MHF Flyer Search Today's Posts Mark Forums Read   Thread Tools Display Modes   #1   November 3rd, 2009, 10:28 AM zpwnchen Member   Join Date: Sep 2009 Posts: 122 Thanks: 82 Thanked 0 Times in 0 Posts help on permutaion & combination Quote: thirteen people on a softball team show up for a game. a) how many ways are there to choose 10 players to take the field? b) how many ways are there to assign the 10 positions by selecting players from the 13 people who show up? I have a) 13 cNr 10 = 286 b) P(13,10) Are they correct? I think order does not matter in a) , but order does matter in b) Advertisement     #2   November 3rd, 2009, 12:02 PM zpwnchen Member   Join Date: Sep 2009 Posts: 122 Thanks: 82 Thanked 0 Times in 0 Posts I found that the answer was in reverse. Why could that be? Any one pls? Last edited by zpwnchen; November 3rd, 2009 at 01:30 PM.   #3   November 3rd, 2009, 05:28 PM awkward Senior Member   Join Date: Mar 2008 Posts: 448 Country: Thanks: 20 Thanked 202 Times in 169 Posts Your original answers look correct to me. The following users thank awkward for this useful post: zpwnchen   #4   November 3rd, 2009, 07:08 PM zpwnchen Member   Join Date: Sep 2009 Posts: 122 Thanks: 82 Thanked 0 Times in 0 Posts Thank you! « combinations | Top | How to invert binary number in schematic? » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Trackbacks are Off Pingbacks are Off Refbacks are Off Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Pre-University Math Help     Pre-Algebra and Algebra     Geometry     Trigonometry     Pre-Calculus     Basic Statistics and Probability     Other topics University Math Help     Calculus     Analysis, Topology and Differential Geometry     Linear and Abstract Algebra     Number theory     Discrete Mathematics, Set Theory and Logic     Advanced Probability and Statistics     Advanced Applied Math     Differential Equations     Business Math     Other Advanced Topics Math Resources     LaTex Help     Mathematics Software Discussion     Calculator Discussion     Useful Math Websites     Mathematics News MHF Lounge     Chat Room         Live Chat     Problem of the Week     Pre-prints and other original work     Formal Debates         Proposals Challenges and Puzzles     Puzzles     Math Challenge Problems MHF Feedback and Announcements Forum     Question, Feedback and Comments     Announcements Our Other "Help Forums"     Physics Help Forum     Chemistry Help Forum All times are GMT -7. The time now is 04:41 PM. Contact Us - Math Help - Archive - Top Powered by vBulletin® Version 3.7.3 Copyright ©2000 - 2009, Jelsoft Enterprises Ltd. SEO by vBSEO 3.2.0 ©2008, Crawlability, Inc. ©2005 - 2009 Math Help Forum

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