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Transcript of Permutations
permutation: is an ordered arrangement of objects. The number of different permutations
of n distinct objects is n!.
1.) 9! = 362,880
2.) 10! / (10-3)! = 10! / 7! = 720
3.) 12! / (12-3) ! = 12! / 9! = 1320 different ways horses can finish
3!/1320 = 0.0045
4.) 40!/(40-5)!*5! = 40! / 35!*5! = 658008
Third Graduating Class!
I <3 Statistics!!
Is the best math teacher ever!
Study for your exam!!!
A horse race has 12 entries. Assuming that there are no ties, what is the probability that the three horses owned by one person finish first, second, and third?
Permutations & Combinations
number of permutations of n distinct objects taken r at a time is nPr = n! / (n-r)! , where r ≤ n.
Distinguishable permutations: n! / n1! ∑ n2! ∑ n3! … nk! , where n1 + n2 + n3 + … + nk = n
Combination: is a selection of r objects from a group of n objects without regard to order and is denoted by nCr.
nCr = n! / (n-r)! r!
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In a state lottery, you must select 5 numbers (in any order) out of 40 correctly to win the top prize. How many ways can 5 numbers be chosen from 40 numbers? You purchase one lottery ticket; what is the probability you will win the top prize?