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Message: [QUOTE="rretzbach, post: 4549714"] I wanted to participate to a ruby quiz again - took a 40 quizzes break. But I can't get a perfect algo for creating a Book. This is probably a spoiler, maybe not <SPOILER> One Idea was to create each ticket, by building 2 rows and complete the last row: if both elements of the column were nil, mark the third element as "to be filled" and so on. But by doing this, I would actually change the probabilities, because the last row depends on the first two rows. So far the only perfect "algo" that came to my mind was to create all possible books and chose one randomly. By this method the chances are perfectly balanged. I mean we're talking about BINGO! It's about money... and you should be able to proof that your algo generates all possible books at equal probability. </SPOILER> Am I right with that, or is this totally nonsense? Either way, please feedback to me :> [/QUOTE]