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Old 2018-04-04, 23:37   #6
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Jul 2009

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Originally Posted by petrw1 View Post
Given a coin that lands heads with probability 0 < p < 1, what is the expected number of flips needed to get N heads in a row?

Solve with p = 0.73 and N = 20.

Then can someone give a general method / formula based only on p and N?

Take 1-(1-p)ⁿ to be the probability of getting heads n times ? Factor in how far you've advanced and find where it hits 50% ?
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