1. Chapter 7 Class 11 Permutations and Combinations
  2. Serial order wise
  3. Ex 7.1

Ex 7.1,1 - Class 11

Last updated at May 29, 2018 by

Ex 7.1, 1 - How many 3-digit numbers can be formed from - Fundamental principal of counting

  1. Chapter 7 Class 11 Permutations and Combinations
  2. Serial order wise
    3. Ex 7.1
    Ex 7.2 →
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Transcript

Ex 7.1, 1 How many 3-digit numbers can be formed from the digits 1, 2, 3, 4 and 5 assuming that (ii) repetition of the digits is not allowed? 3 digit number : Number of 3 digit numbers without repetition = 5 × 4 × 3 = 60 Ex 7.1, 1 How many 3-digit numbers can be formed from the digits 1, 2, 3, 4 and 5 assuming that (i) repetition of the digits is allowed? 3 digit number : Number of 3 digit numbers with repetition = 5 × 5 × 5 = 125

Chapter 7 Class 11 Permutations and Combinations
Serial order wise

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.