It’s simple math!
How A Man Won The Lottery 14 Times Using Unbelievably Basic Math [IFL Science] – “In the 1990s, Romanian-Australian economist Stefan Mandel and his small team entered the lottery and won. Over and over and over again.
The feat, of course, wasn’t achieved through having a really lucky set of numbers. Mandel had a system — one he first used to win a lottery in Romania, before later applying it in Australia and the US.”