If the only number matched was the yellow Mega Ball number itself, then you'll win $2. There are multiple ways to win the Mega Millions drawing. But if you only matched one white number, then you haven't won anything tonight. If you matched one yellow ball (which is the last number drawn), then you'll win $2.
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https://n1-lotto.blogspot.com/2020/02/what-are-best-numbers-for-oz-lotto.html
http://davidfatum.com/9321/who-won-the-uk-euromillions