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Old 2018-04-04, 21:34   #4
Nick
 
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Dec 2012
The Netherlands

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Quote:
Originally Posted by petrw1 View Post
maybe I'm not understanding this right
I think I misunderstood you!

In that case, you can work it out from first principles.
Fix a positive integer \(k\geq N\).
How many ways are there of throwing \(k-N\) times without getting \(N\) heads in a row?
What is the probability of each of those possibilities followed by \(N\) consecutive heads?

Last fiddled with by Nick on 2018-04-04 at 21:34 Reason: Fixed typo
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