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Each of the arrangements, which can be made by taking, some or all of a number of things is called a PERMUTATION.
For Example : Formation of numbers, word formation, sitting arrangement in a row.
  • The number of permutations of 'n' things taken 'r' at a time is denoted by nPr. It is defind as, nPr Description: 875.png
  • nPn = n!

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