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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.
That was great way, but most interviewers request NOT to use in-built methods.
That was amazing!, using series formula for the sum n terms, as the nth sum is (n*(n+1))/2