wiredog sends in a story about how knowledge of lottery rules and statistics has allowed opportunistic players in Massachusetts to spend hundreds of thousands of dollars on tickets while being assured of a massive payoff. Quoting: "Because of a quirk in the rules, when the jackpot reaches roughly $2 million and no one wins, payoffs for smaller prizes swell dramatically, which statisticians say practically assures a profit to anyone who buys at least $100,000 worth of tickets. During these brief periods — 'rolldown weeks' in gambling parlance — a tiny group of savvy bettors, among them highly trained computer scientists from MIT and Northeastern University, virtually take over the game. ... Srivastava calculated that a gambler who bought 200,000 Cash WinFall tickets during four rolldown weeks in a year would win enough to cover the $1.6 million investment and earn a profit of $240,000 to $1.4 million — without ever winning the jackpot."
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