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While staying in a 15-story hotel, Polya plays the following game. She enters an elevator on the $6^{\mathrm{th}}$ floor. She flips a fair coin five times to determine her next five stops. Each time she flips heads, she goes up one floor. Each time she flips tails, she goes down one floor. What is the probability that each of her next five stops is on the $7^{\mathrm{th}}$ floor or higher? Express your answer as a common fraction.

RektTheNoob  Sep 2, 2017
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 #1
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To achieve the desired result, she needs five heads in a row.....

 

And the probability of five heads in a row is   (1/2)5  =  1 / 32

 

 

cool cool cool

CPhill  Sep 3, 2017
 #2
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What is the probability that each of her next five stops is on the 7th floor or higher, You can go down one and go up 4, 

RektTheNoob  Sep 7, 2017

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