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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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Hello guys. I still don't understand why the result case is like that. Let me explain my view. The probability a number except 1 (because 1 and n have GFD 1 and it's prohibited for the problem) toward n where that number is a factor of n is 3 / n. For example, 21 (comes from 3 * 7) only have 4 factor. They are 1, 3, 7, and 21. And 1 is prohibited. So the total is 3. So the probability 3/n. Let me know my mistake, so I know why test case is different of my view. Lo siento, bad English.