Ex 7.1, 3 - How many 4-letter code can be formed using first - Fundamental principal of counting

 

  1. Chapter 7 Class 11 Permutations and Combinations
  2. Serial order wise
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Ex 7.1, 3 How many 4-letter code can be formed using the first 10 letters of the English alphabet, if no letter can be repeated? No. of letters = 10 Code is of the form Total number of possible 4-letter code = 10 × 9 × 8 × 7 = 5040 Hence 5040 ways 4 letter code can be formed

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