The odds are calculated at 49.95% which is what an old dice casino had as odds, it doesn't matter if its lower or higher, the point is to illustrate how using martingale is a waste of time and it's worse than playing a single bet
if you use 40% you can use a smaller multiplier, and hitting 40% is better than hitting 33%, but playing 40% alone will destroy you. If you look at the odds, you switch when it tells you to.
oh yeah btw i was using d'alambert style bets, not martingale.