in how many ways can a student select a programme of 5 courses if 9 courses are available and 2 specific courses are compulsory for every student?
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Out of available nine courses,two are compulsory.Hence the student is free to select 3 courses out of 7 remaining courses.If P is the number of ways of selecting 3 courses out of 7 courses,then
P=C(7,3)
=7!3!(7−3)!
=7!3!4!
=7×6×5×4!3×2×1×4!
=35 ways
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