Check sibling questions

Ex 7.4, 4 - In how many ways can a team of 3 boys and 3 girls

Ex 7.4, 4 - Chapter 7 Class 11 Permutations and Combinations - Part 2

This video is only available for Teachoo black users


Transcript

Ex 7.4, 4 In how many ways can a team of 3 boys and 3 girls be selected from 5 boys and 4 girls? Selecting 3 Boys We have to select 3 boys from 5 boys Here, n = 5 & r = 3 Number of ways = nCr = 5C3 = 5!/3!(5 −3)! = 5!/3!2! = 10 Selecting 3 girls Similarly we have to select 3 girls from 4 girls Here n = 4 & r = 3 Number of ways = nCr = 4C3 = 4!/(3!(4 −3)!) = (4 × 3!)/(3! × 1!) = 4 Hence, Total number of ways = 10 × 4 = 40 Hence, 40 ways to selecting 3 boys & 3 girls from 5 boys & 4 girls

Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.