Math Problem Statement
一共有10的9次方个人,任意两人排列组合有多少种
Solution
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Math Problem Analysis
Mathematical Concepts
Combinatorics
Factorials
Binomial Coefficients
Formulas
Binomial coefficient formula: C(n, r) = n! / (r!(n-r)!)
Theorems
-
Suitable Grade Level
High School
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