It was late, that’s why I missed it, I think 
But thank you very much for answer.
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This rand(a..b) is very useful and needed. It reminds Ruby 
Using :rand or :random can be painful, because of lack of documentation.
@josevalim, incorporate this rand in The Language and polish the docs
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As said above, it is already part of the language: Enum.random(1..3).
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Ahh, ok. Inside Enum. Thanks then
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