How many times do I have to try for winning something if my chances are 20%?
In: 1
1 time: 1/5
2 time: 9/25
3time: 64/125
So your chances are over 50% if you try 3 times. If that is not enough, it is very likely that you will get it in 5 tries. However if you are unlucky, you might not get it no matter how much you try. Lets not forget that your chance is always %20 for each try. So if you didn’t get it even after 10 tries, your chance is still %20 for your next try.
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