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Am I missing something here?
As there are 10 prizes, your chance to win one of prizes is
(
Your tickets /
Total tickets )* 10
(As no one can win more than one prize, your chance is actually a bit higher, off course)
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Also, I was wondering if 1 person can win twice in the same week. The tickets are anonimized, so there's no way of eliminating a person once one of their tickets has been drawn. That should make it theoretically possible to win even all 10 spots?
It's impossible to win more than one prize.
For determining winners, some mathematical calculations are done.
In the case the picked user has won one of previous prizes, calculations are done again.