In how many ways can a student choose 5 ...

In how many ways can a student choose 5 courses out of 9 if 2 courses are compulsory ?

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A student is to choose 5 courses out of 9 in which 2 courses are compulsory.
as 2 courses are compulsory, he is to choose 3 courses out of 7 courses in ` ""^7C_3=35` ways.

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