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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.
Nop, the text says "below n" and not "equals or below n".
So for n=9, then 14 is the correct answer (3 + 5 + 6).
Also, if you really want inclusive IntStream, use
IntStream.rangeClosed(start, end)Please use spoiler flag next time.