The 2015 changes extended the main ball pool to 69 balls, adding another ten numbers. However, at the same time, the Powerball pool decreased from 35 to 26. This means that although the overall odds of winning the jackpot have increased to 1 in 292 million, the overall odds of winning any prize have decreased to 1 in 24.87. The first draw incorporating the changes took place on October 7th and also saw an increase in the tier three prize (matching 4+1) climb to $50,000.
On Jan 31, 2010, the date of the cross-sell expansion, Mega Millions and MUSL each added lotteries; eight Powerball members added Mega Millions by May. The Montana Lottery joined Mega Millions on March 1. Nebraska added Mega Millions on March 20; Oregon followed on March 28; Arizona joined Mega Millions on April 18; Maine added Mega Millions on May 9; Colorado and South Dakota joined Mega Millions on May 16. The U.S. Virgin Islands joined Mega Millions in Oct 2010.
Powerball numbers are drawn from two sets of numbers, so the odds of winning a prize are calculated by combining the odds for both sets of numbers for all prize levels. The odds for matching just the Powerball are calculated by combining the odds of selecting the Powerball and the odds of not selecting any of the five numbers from the first set of numbers drawn.
Before the advent of government-sponsored lotteries, many illegal lotteries thrived, such as number games. The first modern government-run US lottery was established in Puerto Rico in 1934. This was followed, decades later, by the New Hampshire lottery in 1964. Instant lottery tickets, also known as scratch cards, were introduced in the 1970s and have become a major source of lottery revenue. Individual lotteries often feature three-digit and four-digit games akin to numbers games; a five number game, and a six number game (the latter two often have a jackpot.) Some lotteries also offer at least one game similar to keno, and some offer video lottery terminals. Presently, many US lotteries support public education systems.

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In California, prize levels are paid on a parimutuel basis, rather than the fixed lower-tier amounts for winners in other Mega Millions jurisdictions. California's eight lower-tier Mega Millions prize pools are separate from those shared by the other 45 lotteries. California's second prize is a "secondary jackpot"; its payout sometimes exceeds $1 million cash, even though California does not offer the Megaplier.[33]
In 1998, Florida was given permission by its government to participate in a multi-state game. It was set to offer Powerball; but in early 1999, new governor Jeb Bush prevented Florida from joining since he believed Powerball would hurt the existing Florida Lottery games. In 2008, Governor Charlie Crist finally allowed Florida to join MUSL, on Jan 4, 2009.
Nowadays there is a plethora of websites to choose from and new companies offer online lottery ticket service every day. Due to the nature of this industry and the fact that newcomers are popping up all over, it is advisable to be diligent and check out the lottery ticket provider carefully before you decide to buy Powerball tickets online with them. This is easily done with a quick google search and an investment of 5 minutes on your part. Trust us, the five minutes is worth it to be sure that when/if you play Powerball online and win, you actually receive your jackpot winnings.
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