| In how many ways can a student chose 5 courses out of 9 courses if 2 specific courses are compulsory for every student?
A. 35
B. 48
C. 64
D. 54
Right Answer is: A
SOLUTION
Since every student needs to choose 5 courses out of which 2 are compulsory. So, the student needs to choose 3 subjects out of 7.
No. of ways for choosing 3 subjects out of 7 is 7C3
Applying formula, nCr = 
, we get
= 35 ways.