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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.
While I find it pretty and elegant, this might need to allocate quite a lot of space in case of big numbers. Is there something I'm missing which makes is efficient in F#?
Therefore, I personally don't find it best practice, as voted, I would use math formula for sum of arithmetic series.