Check sibling questions

Ex 7.4, 9 - In how many ways can a student choose a programme - Combination

Ex 7.4, 9 - Chapter 7 Class 11 Permutations and Combinations - Part 2

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


Transcript

Ex 6.4, 9 In how many ways can a student choose a programme of 5 courses if 9 courses are available and 2 specific courses are compulsory for every student? Hence, the student has to select 3 courses out of remaining 7 courses Here, n = 7 & r = 3 No of ways selecting 3 course out of 7 course = nCr = 7C3 = 7!/(3!(7 3)!) = 7!/(3!(7 3)!) = 7!/3!4! = (7 6 5 4!)/(3 2 1 4!) = (7 6 5 )/(3 2 1) = 35 ways

Ask a doubt
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 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.