Basic Probability-2

Basic Probability-2 - are chosen at a time (r n). The...

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1 Basic Probability Permutations and Combinations: - Combinations: - The number of different packages of data taken r at time from a data set containing n items The order of items is from a data set containing n items. The order of items is inconsequential. The number of taken r at a time (r n) is written n C r r! r n n! C r n )! ( = (example) Basic Probability Permutations and Combinations: Permutations: Each of all or part of a set of items. change order different arrangement different permutations Basic Probability Permutations and Combinations: - Permutations: A total of n distinguishable items to be arranged. r items
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Unformatted text preview: are chosen at a time (r n). The number of of n items chosen r at a time is written n P r. (n-r)! n! r n n n n = + = ) 1 )...( 2 )( 1 )( ( P r n (example) Basic Probability Permutations and Combinations:- Permutations (classes): To calculate the number of considering classes of similar items. A total of n items to be placed. n 1 items are the same of one class, n 2 are the same of the second class and n 3 are the same as a third class. n 1 +n 2 +n 3 =n The number of permutations of n items taken n at a time: ! n n n n! 3 2 1 n n ! ! P = (example)...
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This note was uploaded on 02/13/2012 for the course MATH 2320 taught by Professor Glyn during the Fall '11 term at Minnesota.

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