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A few notes on Combinatorics

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By asmith26 1 min read

Combinatorics is about counting the number of ways things can be done. It is very useful when dealing with discrete probability and equally likely outcomes.

The number of ways for choosing \(r\) elements from a set of \(n\) elements is:

A table of equations used for various combinatoric computations

  • Top-right is permutations (ordered).
  • Bottom-right is combinations (unordered).
Mathematics, Probability
combinatorics probability mathematics
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