October 23rd a winning ticket was sold for the for the largest Mega Millions jackpot in history.
The odds of winning the lottery are not good, specifically the odds of winning the mega millions jackpot is 1 in 302,575,350. This is calculated using classical probability as follows:
1 winning set of #s divided by the total number of different mega millions tickets where the
total possible combinations of 70 integers choose 5 and 25 integers choose 1 = (70 C 5) * (25 C 1) = 302,575,350
Listen to the NPR story about a guy who flipped the odds of winning the lottery and figured out how to guarantee a win.