Expected flips for HT
A fair coin is flipped until the pattern HT appears. What is the expected number of flips?
Show hints (2)+
- Split into 'reach the first H' then 'wait for a T'.
- No self-overlap ⇒ simpler than HH.
Answer
Reveal answer →Final answer
4
Create a free account to see the full worked solution and track your progress.
Interview format: Market Maker, Numerical Reasoning Tests