Ex 7.2, 5 - Evaluate n!/(n-r)! , when n = 6, r = 2 - Class 11 - Factorial

  1. Chapter 7 Class 11 Permutations and Combinations
  2. Serial order wise
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Ex7.2, 5 Evaluate n!/(n−r)! , when n = 6, r = 2 n!/(n−r)! Putting n = 6 & r = 2 = 6!/(6−2)! = 6!/4! = (6 × 5 × 4!)/4! = 6 × 5 = 30 Ex7.2, 5 Evaluate n!/(n−r)! , when (ii) n = 9, r = 5 𝑛!/(𝑛 − 𝑟)! Putting n = 9, & r = 5 = 9!/(9−5)! = 9!/4! = (9 × 8 × 7 × 6 × 5 × 4!)/4! = 9 × 8 × 7 × 6 × 5 = 15120

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