If we just look at the odds alone, the EuroMillions odds make it 3.1 times harder to win. But if we take into account that extra 50p per ticket, it means that the odds of winning EuroMillions vs National Lottery are now 3.8 times worse.
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https://lottery-life.blogspot.com/2020/02/how-do-you-play-euromillions-in-stores.html
http://lovesingles.pw/11426/what-do-you-need-to-win-oz-lotto