Math CentralQuandaries & Queries


Question from Leah, a student:

When should you use factorials?


Factorials are used in lots of places!

  • counting the ways to arrange things
  • finding "Poisson" probabilities connected with rare events
  • finding power series to approximate functions
  • computing binomial coefficients, which are used for:
  • finding binomial expansions
  • finding the number of ways to choose N things out of M
  • finding various probabilities connected with sampling

Good Hunting!

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