Question

Is it possible for r to be greater than n in nCr? explain?

Answer 1

No, that would make no sense.

You can't choose 5 books from a pile of 3 books.

Answer 2

if r>n the nCr=0

Answer 3

provided n and r are integers

Answer 4

is there just a simple answer for this question? other then no.

Answer 5

no, if you have 3 things you cant pick five of them.

Answer 6

(we dont pick one twice)

Answer 7

In general, it is possible to generalise the idea of nCr, just depends on how you want to generalise I think... here is what you want perhaps:
https://en.wikipedia.org/wiki/Binomial_coefficient#Two_real_or_complex_valued_arguments