The Six Sigma Black Belt should know factorials, permutations and combinations, and how to use these in commonly used probability distributions.
六西格玛黑带应了解析因、置换、合并等方法，以及它们在概率分布中的一般应用。
Permutations and Combinations are important basis in mathematics. They are often used, especially in Probability Statistics.
排列组合是数学的一个重要基础，特别是在《概率统计》学中经常要用到。
Permutations and Combinations are important basis in mathematics. They are often used, especially in Probability Statistics.
排列组合是数学的一个重要基础，特别是在《概率统计》学中经常要用到。
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