Last updated at May 29, 2018 by Teachoo

Transcript

Example 7 Evaluate n!/r!(n r)! when n = 5, r = 2. !/ !( )! Putting n = 5, r = 2 5!/2!(5 2)! = 5!/(2! 3!) = (5 4 3!)/(2! 3!) = (5 4 )/(2 1 ) = 20/2 = 10

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7 You are here

Example 8

Example 9

Example 10

Example 11

Example 12

Example 13 Important

Example 14

Example 15

Example 16 Important

Example 17

Example 18

Example 19 Important

Example 20

Example 21

Example 22

Example 23 Important

Example 24

Chapter 7 Class 11 Permutations and Combinations

Serial order wise

About the Author

Davneet Singh

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.