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OpenStudy (anonymous):
what is the formula for Permutations and Combinations?
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OpenStudy (amistre64):
permutations tend to be a "pick" of numbers: P(5,2) means 5*4 ; combo C(5,2) is just P(5,2)/2!
OpenStudy (amistre64):
then there are others that relate to how many times something appears in the same setup and what nots, but those are the basics i believe
OpenStudy (amistre64):
P(n,r) means n*(n-1)*(n-2)*... "r" number of times
OpenStudy (amistre64):
P(10,7) = 10.9.8.7.6.5.4
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