Example 1 - Find number of 4 letter words formed from ROSE - Fundamental principal of counting

  1. Chapter 7 Class 11 Permutations and Combinations
  2. Serial order wise
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Example 1 Find the number of 4 letter words, with or without meaning, which can be formed out of the letters of the word ROSE, where the repetition of the letters is not allowed . Number of letters which can be filled in different places are Number of ways in which 4 places can be filled = 4 × 3 × 2 × 1 = 24 Hence, number of 4 letter words is 24

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