Ok, here are the combinations:
Euro Millions: 5/50 + 2/9 ==> 76,275,360 combinations
Mega Millions: 5/56 + 1/46 ==> 175,711,536 combinations
Powerball: 5/55 + 1/42 ==> 146,107,962 combinations
Therefore, Euro Milllions is easier to hit, followed by Powerball, and then Mega Millions.
According the criteria indicated, looks like Euro Millions is the best.
But as Euro Millions is easier to hit, it doesn't have much chance to accumulate a big jackpot. At the end US lottos usually shows bigger jackpots, even considering the cash option and tax cuts.
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