Thus, except heavily tilted wheel, or cheating RNG,
straight numbers, eu, 37x100spins=3700spin,
mathwise have 100hit expectation,
the worst, if you research , may only hit 60hit/3700spins.
If if see few number sleep for, or only hit once or twice in, say 500spins,
Then you bet them for next 2500spins, and you bet 2 or 3, or 4 numbers at the same time,
With variance-avoidance strategy, and progression, you may produce profit.