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Coin tossing (Posted on 2004-06-11) Difficulty: 3 of 5
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?

See The Solution Submitted by Federico Kereki    
Rating: 3.6667 (6 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
drat | Comment 5 of 26 |
jeez, if i had gone with my overlapping idea, i'd have picked 10 (although not using any real math) and now i see that Hobson and Charlie are going with 10. i may dwell on this comfortably tense plateau of the student... forever!
  Posted by rixar on 2004-06-11 18:30:16
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