I did not actually understand what your question.
But I guess, since u say probability, of a event...
Let me say..
Since we cant predict,
but we can see a "MOST. or LEAST" of an event based on past real record.
We can always see say 10spins of BLACK, but never see 100spins of BLACK! never!...
We can see 1black and 20red, but never 10black and 200Black permutation! never!
and we never yet to see less than 69win, in 200spins!
or less than 30win/100spins...[in B&M casino., but RnG had 25/100spins!!!]
That u can bet on..
so now u can search for a way to bet, confident that there will no less than [69win in next 200spins].
Hope that help.