Streak then a head count
A fair coin is flipped five times. Given that the first two flips both landed heads, what is the probability that the five flips contain exactly three heads in total? Give your answer as a decimal (to 4 decimals).
Show hints (2)+
- The first two heads are banked - how many more heads do you need, and from how many fresh flips?
- Count exactly one head in three independent fair flips.
Answer
Reveal answer →Final answer
0.375
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Asked at: Timed Mental-Math & Sequences, ETF Market-Making