[science_man_88]

Originally Posted by petrw1

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?

Thanks

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% ?