Ex 7.3, 8 - How many words can be formed using EQUATION - Permutation- non repeating

  1. Chapter 7 Class 11 Permutations and Combinations
  2. Serial order wise
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Ex 7.3, 8 How many words, with or without meaning, can be formed using all the letters of the word EQUATION, using each letter Exactly once? Number of letters in word ‘EQUATION` = 8 n = 8 If all letters of the word used at a time r = 8 Different numbers formed = nPr = 8P8 = 8!/(8 −8)! = 8!/0! = 8!/1 = 8! = 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 40320

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