That's not the correct way to figure it out, that's why I posted, to find out what the correct odds are. This explanation completely ignores how the number is generated, so cannot be the correct odds for each tier. This would be correct if a number was randomly generated between 0-10000 (except in the case of the last tier, he's wrong on the odds, it's 1:10,000; not 1:20,000). But that's not how the number is generated. It's far more complex than that and the process was detailed in my original post on the matter (and quoted above).