You should look at EV (expected value), not odds of winning.<p>Here are some cautions:<p>(1) A decent amount of the EV for lottery tickets is likely in large prizes, and your return will be quite variable unless the number of tickets you buy is about the same magnitude as the odds of winning the rarest prizes<p>(2) Win tables don't count taxes, but your actual winnings will be taxed if large; so your effective EV (including taxes) will be less<p>(3) +EV lottery tickets are theoretically possible for "jackpot" lotteries like powerball if you only play when the jackpot is sufficiently large, but see (1) and (2) before you conclude it's a way to make free money.