thing,
Mathematically, '(b)' must be true. Yet the trouble was that some roulette wheels seemed to have memories, in which case the odds on the 'chop' on your last trip could be 3x30 = 90%, as you suggest. And we know that the final overall figure was almost 50% - although training accidents account for part of that - not that matters much to you, if you're one of the unlucky ones.
Was ever an analysis done of the percentage of 'chops' per (single or five-trip experience) bands, that might show a pattern ?
Really we want to have one of the old-timers here (and surely there must be some left) to tell us what sustained them through a period of mental stress such as few men are called on to endure.
D.