The Total solution for NCERT class 6-12
Given 9 courses areavailable and 2 specific courses are compulsory for every student
Here 2 courses arecompulsory out of 9 courses, so a student need to select 5 – 2 = 3 courses
∴ Number of waysin which 3 ways can be selected from 9 – 2(compulsory courses) = 7 are 7C3
∴ Number of ways astudent selects 5 courses from 9 courses where 2 specific courses arecompulsory are: 35