http://themathforum.forumotion.com/counting-probability-f5/-t1.htm Mon, 15 Sep 2008 02:32:16 GMT 10 http://www.cyneer.com/nxtwiki/uploads/Main/favicon1.ico http://themathforum.forumotion.com/counting-probability-f5/-t1.htm http://themathforum.forumotion.com/counting-probability-f5/spam-t121.htm spammer ]]> Counting & Probability Mon, 15 Sep 2008 02:32:16 GMT http://themathforum.forumotion.com/counting-probability-f5/spam-t121.htm#609 http://themathforum.forumotion.com/counting-probability-f5/spam-t121.htm http://themathforum.forumotion.com/counting-probability-f5/combinatorics-t109.htm hunter34 {3^0, 3^1, 3^2, 3^3, 3^4} if we are allowed to use the same power more than once. For example, 5 can be represented, but 8 cannot.

1994 UNC Charlotte Comprehensive Exam]]> Counting & Probability Sun, 07 Sep 2008 17:02:02 GMT http://themathforum.forumotion.com/counting-probability-f5/combinatorics-t109.htm#577 http://themathforum.forumotion.com/counting-probability-f5/combinatorics-t109.htm http://themathforum.forumotion.com/counting-probability-f5/easy-counting-t17.htm skittles Find the number of ways the letters from the word SUPERCALIFRAGILISTICEXPEALIDOCIOUS can be arranged, using all of the letters. Counting & Probability Thu, 14 Aug 2008 00:50:47 GMT http://themathforum.forumotion.com/counting-probability-f5/easy-counting-t17.htm#30 http://themathforum.forumotion.com/counting-probability-f5/easy-counting-t17.htm http://themathforum.forumotion.com/counting-probability-f5/simple-problem-t7.htm AIME15
Answer: Ed has 3 choices, Edd has 2, and Eddy has one. So our answer is 3*2*1=6.

Note: 3*2*1 is the same as 3!. In general, n!=n*(n-1)(n-2)...*2*1.]]> Counting & Probability Wed, 13 Aug 2008 21:48:41 GMT http://themathforum.forumotion.com/counting-probability-f5/simple-problem-t7.htm#8 http://themathforum.forumotion.com/counting-probability-f5/simple-problem-t7.htm