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Alex flips a fair coin four times. What is the probability that he flips heads three times in a row?

 Sep 13, 2021
 #1
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The probability of getting 3 heads in a row is:

 

1/2 x 1/2 x 1/2 ==1 / 8

 Sep 13, 2021
 #2
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This graph might help explain:

 Sep 13, 2021
 #3
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There are   24 = 16 possible outcomes

there are only 2 ways to get 3 heads in a row:   t  h h h    and    h h h t

2/16 = 1/8 as posted

 Sep 13, 2021

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