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Summary

  • The number of permutations of n different things taken r at a time is denoted as nPr
  • n factorial is the product of n, n - 1, n - 2, ...1
  • Permutation means counting the number of ways in which some or all objects at a time are arranged, whereas combination means counting the number of ways in which some or all objects at a time are selected
  • The number of combination of n different objects taken r at a time is denoted as
    nCr.




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