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Ok then how would such a ploy work on this game where rollovers happen all the time?

It would work. The recipe is simple: play only those rounds where the expected payback is larger than total amount paid for tickets (including yours, of course). Against whom you play (i.e. whose money are you getting)? Those who play in low-jackpot rounds. I think I remember there was a round of Powerball or something similar where the price of enough tickets to guarantee the jackpot was lower than the jackpot, and someone collected enough money to go for it (the main obstacle, IIRC, being the requirement to fill the tickets in manually).

Boy, I forgot all my statistics. Can anyone quickly calculate how many different unordered combinations of 6 out of 43 are there? Ah, 175711536, apparently. So, you will have to wait for several more rollovers... If you pay those 175M$, you are guaranteed to hit the jackpot, but might have to share it with someone else. That's why jackpot has to be higher than total amount paid.
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