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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.
there is no need to change the original formula to solve the problem...
Formula in the task's description is correct. It becomes incorrect if you place parentheses in wrong places.
I could be blind but how is it different from the one given in the description?