If you are ever stupid enough to buy a casino "system" you will notice that the "winning" ones are based on a small spin sample usually 10000 or less spins (which proves very little) - so yes in the short run it is theoretically possible to martingale your way to profit. But either you blow out or the return on capital becomes so low you are better off not taking the risk to start with.
If you did want to do this in FX then best to not use a random entry with equal SL and TP but base entries on some indicator -say CCI. Could a CCI indicator fail 8 times in a row? yes but I'd bet your odds are better than a random entry.
If you did want to do this in FX then best to not use a random entry with equal SL and TP but base entries on some indicator -say CCI. Could a CCI indicator fail 8 times in a row? yes but I'd bet your odds are better than a random entry.