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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.
The best way to figure the problem out mathematically is to make a table of the values and find some patterns, although I did need to use cubic regression on a calculator...
#Calc
You can print the parameters at the beginning to see what the test cases are (through the log).