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Permutation and Combinations

Permutation and Combinations

Q In this section you learned about a variety of counting methods and then how to apply these methods to computing probabilities. Two counting methods that are often confused are permutations and combinations. Discuss how you will know when it is appropriate to count using a permutation and when it is appropriate to count using a combination. Give an example of when you would count objects using a permutation and an example of when you would count using a combination.

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permutation is used when order matters. For example an investor wants to invest 10%, 20%, 705 of his money into three stocks. There are 20 stocks to choose from. In this case since stocks are not invested equally, the order matters; so permutation should be used.