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Possible Duplicate:
Probability for the length of the longest run in $n$ Bernoulli trials

Suppose a fair coin is tossed n times. Determine the probability that exactly r consecutive heads will occur. Is there a closed form to solve this problem?

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    This is the longest run problem. It does admit a closed form solution. See [this](http://math.stackexchange.com/questions/59738/probability-for-the-length-of-the-longest-run-in-n-bernoulli-trials) earlier question of mine.2012-11-15

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