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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.
Same problem for me with PHP
It would seem you are correct.
Does Ruby allow input modification? The translation seems vulnerable to that. Are you modifying your inputs?
( I don't know Ruby, so I'm poking in the dark a bit. )
Yes, but as some others should have done you should read more carefully the description:
Print some results and see what is the population for "50".