From: "Jan E." <lists@...>
Date: 2012-06-28T17:06:51+09:00
Subject: Re: Is this the correct use of rand?

Hi,

If you call rand(n) with n being an Integer, the method will return a 
pseudorandom Integer r with 0 <= r < n. So the result will never be n. 
If you want to include n, you have to call rand(n + 1).

In newer versions of Ruby you can also pass a range to the rand method, 
which makes the whole thing more intutitive:

rand(0..n)

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