Ex 6.3

Chapter 6 Class 11 Permutations and Combinations
Serial order wise

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### Transcript

Ex 6.3, 5 (Method 1) From a committee of 8 persons, in how many ways can we choose a chairman and a vice chairman assuming one person cannot hold more than one position? We need to choose a chairman & a vice-chairman out of 8 person Here n = Number of people = 8 & r = Number of people to be chosen = 2 Number of ways choosing a vice-chairman = 8P2 = 8!/(8 2)! = 8!/6! = (8 7 6!)/6! = 8 7 = 56 ways Ex7.3, 5 (Method 2) From a committee of 8 persons, in how many ways can we choose a chairman and a vice chairman assuming one person cannot hold more than one position? We need to choose a chairman & a vice chairman out of 8 person Number of ways we can choose = 8 7 = 56 ways

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#### Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.