I find probability questions interesting, because they often defy intuition. Particularly for me are those that involve waiting times. Other than the basic idea of an event of probability p needing on average 1/p trials to occur. But here's one not that trivial, yet still fairly easy to solve -- with the right approach.
On average, how many times do you need to flip a fair coin before you have seen a (continuous) run of an odd number of heads followed by a tail?
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bonanova
I find probability questions interesting, because they often defy intuition. Particularly for me are those that involve waiting times. Other than the basic idea of an event of probability p needing on average 1/p trials to occur. But here's one not that trivial, yet still fairly easy to solve -- with the right approach.
On average, how many times do you need to flip a fair coin before you have seen a (continuous) run of an odd number of heads followed by a tail?
For example, T T H H H H T H H H T took 11 flips.
Edited by bonanovaclarification
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