My Math Forum Permutation or Combinations

 Real Analysis Real Analysis Math Forum

 July 19th, 2009, 11:24 AM #1 Newbie   Joined: Jul 2009 Posts: 1 Thanks: 0 Permutation or Combinations I am having a hard time distinguishing which problem is a permutaion or combination. (1) In how many ways can the three fastest runners finish a race if there are 10 runners racing. (2) In how many distinct ways can the digits in the telephone number 778-866-5555 be arranged?
 July 20th, 2009, 03:28 PM #2 Newbie   Joined: Feb 2009 Posts: 8 Thanks: 0 Re: Permutation or Combinations (1)Combination (2)Premutation
 August 2nd, 2009, 12:54 PM #3 Member   Joined: Jul 2009 Posts: 34 Thanks: 0 Re: Permutation or Combinations They are both permutations, because in case of a combination, the order doesn't matter. And in both cases the order does matter. An example of a combination: How many distinct committees can you form out of 30 students? The order in such a committe doesn't matter.
 August 4th, 2009, 07:43 AM #4 Global Moderator     Joined: Nov 2006 From: UTC -5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms Re: Permutation or Combinations Jeranimo is quite correct here.

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post maths4computing Advanced Statistics 4 July 21st, 2013 02:06 PM calh27 Advanced Statistics 4 June 11th, 2012 04:48 PM Punch Algebra 5 March 30th, 2012 08:36 PM Punch Algebra 15 January 31st, 2012 09:48 PM bugrocket Advanced Statistics 2 January 23rd, 2011 04:02 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top