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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.
You're dealing with floats and not integers.
You must find another implementation of combination using only integers, for integer division, use //.
Reorder operations to avoid floating point numbers.