more ticket sales, and the jackpots keep growing. $2 billion in november. $1.3 billion last july. $1.5 billion in 2018. in michigan 78 hospital workers just split a million dollar jackpot. it s a fantastic feeling. reporter: so why have today s power ball and mega millions jackpots gotten so big? essentially mega millions changed the numbers matrix, the field of numbers that you choose from. before 2017 the first set of numbers was between 1 and 75 and the megaball was between 1 and 15. today the first set of numbers is between 1 and 70, and the second set, the mega ball, 1 to 25. the chance of winning the jackpot shrank to 1 in 30202 millioion. another change, tickets went from $1 to $2 each, more money for the jackpot and the states that participate. the odds of winning never change, whether you play at the very beginning when it s $21