I threw a coin n times, and never got three tails in a row. I calculated the odds of this event, and found out they were just about even; 50%-50%. How many times did I throw the coin?

A second question: what were the chances of having not gotten three heads in a row either?

(In reply to solution by Charlie)

I think the second answer should be a conditional probability: the chance of not having gotten three heads GIVEN that three tails weren't gotten either, so the result would be higher.

Posted by Oskar on 2004-06-12 00:04:51