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10 questions from this quiz
Addition rule
Multiplication rule
Order matters for permutations only
120120120
121212
202020
n!(n−r)!\frac{n!}{(n-r)!}(n−r)!n!
n!r!(n−r)!\frac{n!}{r!(n-r)!}r!(n−r)!n!
606060
101010
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