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avatar+1289 

To win a game with a fair coin, you must flip n+1 heads in a row, where $n$ is the total number of tails flipped so far. So if your first flip is heads, you win and the game is over; if your first flip is tails but your next two in a row are heads, you win and the game is over; and so on. What is the probability that you win by flipping one head? Express your answer as a common fraction.

 Jan 15, 2026
 #1
avatar+158 
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The answer is 1/4.

 Jan 15, 2026
 #2
avatar+2292 
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To win a game with a fair coin, you must flip n+1 heads in a row, where is the total number of tails flipped so far. So if your first flip is heads, you win and the game is over; if your first flip is tails but your next two in a row are heads, you win and the game is over; and so on. What is the probability that you win by flipping one head? Express your answer as a common fraction.     

 

It has to be heads on the first flip, so  1 / 2     

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 Jan 16, 2026

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