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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.
Read the description N times, still couldn't get it. Looked at example, remembered doing something related at school. Blindly implemented mathematical solution and solved the problem.
Programming is != Mathematics, lecturers and teachers usually fails to understand this, it looks like similar problems are coming up to the surface in Codewars as well.