5653054
Description
Note by Sin Kei Chan, updated more than 1 year ago
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Created by Sin Kei Chan
over 8 years ago
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Page 1
| Order matters | Order does not matter--------------------------------------------------------------------------------------------------------------------------------------------------Repetition allowed | n^r | nHr = n+r-1Cr--------------------------------------------------------------------------------------------------------------------------------------------------Repetition not allowed | n(n-1)(n-2)...(n-r+1)=n!/(n-r)!=nPr | n(n-1)(n-2)...(n-r+1)/2=n!/r!(n-r)!=nCr
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