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Many heads (Posted on 2004-12-13) Difficulty: 3 of 5
What is the expected number of times you must toss a (fair) coin until you get n consecutive heads?

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answer | Comment 4 of 6 |
let E(n) denote the expected number of times (fair) coin must be tossed until  n consecutive heads is obtained.

Then E(n) = 2n+1 − 2.
  Posted by K Sengupta on 2007-04-17 12:13:00
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