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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.
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Not an issue, there are a lot of math based katas.
Remember to mention the language, that happened in Scala only. Fixed.
Calculate the row sums of this triangle from the row index (starting at index 1) e.g.:I think this should be changed to
Calculate the sum of values for the row in this triangle at the given row indexOtherwise, it leaves the impression that you need to sum all of the previous rows.