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Ex 7.1, 2 - How many 3 digit even numbers can be formed - Fundamental principal of counting

  1. Chapter 7 Class 11 Permutations and Combinations
  2. Serial order wise
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Ex 7.1,2 How many 3 digit even numbers can be formed from the digits 1, 2, 3, 4, 5, 6 if the digits can be repeated? Let the 3 digit even number be Only 3 numbers are possible at units place (2 , 4 & 6) as we need even number. But at tens & hundreds place all 6 are possible Number of 3 digit even numbers = 3 × 6 × 6 = 108

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