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11 questions from this quiz
For small sample spaces
121212
Arrangements of nnn distinct objects
242424
Order matters vs doesn't matter
n!(n−r)!\frac{n!}{(n-r)!}(n−r)!n!
n!r!(n−r)!\frac{n!}{r!(n-r)!}r!(n−r)!n!
For multiple overlapping groups
303030
120120120
Fundamental Principle of Counting
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