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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.
A float probably isn't the best choice of variable type. And if you actually calculate factorial(n), you are likely to overflow a small-sized integer.
Hint: You don't have to actually calculate factorial(n). Try shuffling the formula around.
You should provide the input for that test to check if there is a problem or not.