Ex 7.2,5 - Chapter 7 Class 11 Permutations and Combinations - Part 2

Advertisement

Advertisement

  1. Chapter 7 Class 11 Permutations and Combinations (Term 2)
  2. Serial order wise

Transcript

Ex 7.2, 5 Evaluate n!/(n โˆ’ r)! , when (ii) n = 9, r = 5 ๐‘›!/(๐‘› โˆ’ ๐‘Ÿ)! Putting n = 9, & r = 5 = 9!/(9 โˆ’ 5)! = 9!/4! = (9 ร— 8 ร— 7 ร— 6 ร— 5 ร— 4!)/4! = 9 ร— 8 ร— 7 ร— 6 ร— 5 = 15120

About the Author

Davneet Singh's photo - Teacher, Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.