8-2:permutations and combinations english casbarro unit 8
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8-2:Permutations and 8-2:Permutations and CombinationsCombinations
8-2:Permutations and 8-2:Permutations and CombinationsCombinations
English CasbarroEnglish CasbarroUnit 8Unit 8
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A permutation is all possible arrangements of people or things where order is important.
A linear permutation is the arrangement of people or objects in a line.
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Permutations with repetition
Ex. In how many ways can you arrange the letters in geometry?
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For our first example, we had the following problem.
Suppose it had said instead: “Ten students are in a race. The top three willmove on to the finals”. Does it matter now which is first, which is second,
or which is third? In this situation, you use a combination.
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Ten students are in a race. The top three will move on to the finals. How many ways can this happen?
Order is not important here– so you would use combinations. It is written 10C3.
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Deciding whether order is important
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and arrange the
four drawings from left to right on the wall?