That's how pyramid systems work. If you cover all the possibilities, you will obviously be able to have a winner.
There are 32 ties in the first round (we'll ignore the play-in for the sake of simplicity). If you cover all the possiblities, the chances of picking all the matches correct are 32^2, or 32 squared. Replicate that across the whole tournament and you will get the winning bracket, the chances of which are 1/ (32^2) x 1/(16^2) x 1/(8^2) x 1/(4^2) x 1/(2^2) x 1.
It's not so much the fact they are lucky but that they are not believers in the opinion of the herd. The thing is this wouldn't work in terms of betting because you would make so many losses for that sole win. Watch Derrin Brown's The System - i guess its on YouTube somewhere - to see how it could work with horse racing. It's just probabilties.
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