The best thing you can do is pick a number that you are sure will be less popular. Although it doesn't increase your chances of winning, it does increase your chances of getting a bigger payout if you do win (less people to share the prize with).
However, I don't play the lottery, because there is a negative expected value.
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http://img.imgcake.com/nio/bokbokbokpngur.png
Ok everyone this is Bartz so just remember.