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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 dont even need loops, arithmetic progression sum is (a1+an)*n/2. I guess that exercise is about learning synthax. Otherwise i would be able to do it in straightforward formula in excel without loops.