How many times do I have to try for winning something if my chances are 20%?
In: 1
you’ll never reach 100% certainty of winning.
the way to calculate it is actually to calculate the odds of *not* winning.
for each try, the odds of not winning is 80%. or 0.8.
then just raise it to the power of the number of attempts.
so after 1 try, the odds of not winning is 0.8. so the odds of winning are 20%
after 2 tries the odds o not winning is 0.8^(2 =) 0.64 = 64%. So the odds of winning are 36%
after 3 tries the odds of not winning are 0.8^(3) = 0.512 = 51%. So the odds of winning are 49%
after a large number of tries, the odds of not winning at least one get very small, and the odds of winning at least once are very high, but never 100%
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