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 Amsco Integrated Algebra I: Permutations
This is a free lesson from our course in Amsco's Integrated Algebra
 
   
This lesson covers basic concepts, symbols and representation of permutation. A permutation is an arrangement of objects or things in some specific order. Since a permutation is the number of ways you can arrange objects, it will always be a whole number. For any natural number n, the number of permutations of n objects taken n at a time can be represented as nPn=n!=n(n-1)(n-2)(n-3)........3*2*1. In general if we have a set of n different objects, and we make arrangements of r objects from this set then nPr=n(n-1)(n-2)(n-3)........(n-r+1) For example: number of permutations of six objects, taken two at a time is 30. It could be expressed in two possible ways i.e. 6P2 = 6* 5 = 30 or 6P2 = 6!/4! = 30 The video below will explain in detail with the help of several examples.
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