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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
C#
When m=6540715897 and n=48 it expects -1, but the answer should be 11. Same problem in Random Tests, m=5985 and n=34 expects -1, but the answer is 4.
http://www.wolframalpha.com/input/?i=%2848+choose+11%29+%3E+6540715896
http://www.wolframalpha.com/input/?i=%2834+choose+4%29+%3E+5985