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12 questions from this quiz
An arrangement in a specific order
When order of selection matters
Product of all positive integers up to nnn
24
n!n!n!
n!(n−r)!\frac{n!}{(n-r)!}(n−r)!n!
60
n!p1!×p2!×…\frac{n!}{p_1! \times p_2! \times \ldots}p1!×p2!×…n!
They are reduced
3
Counting problems and probability
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