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Suppose we flip four coins simultaneously: a penny, a nickel, a dime, and a quarter. What is the probability that the penny and dime both come up the same? 

 

Thanks in advance!

 Aug 3, 2018
edited by Guest  Aug 3, 2018
 #1
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The nickel an the quarter doesn't affect it. We list out the possibilities.

 

p:h d:h

p:h d:t

p:t d:h

p:t d:t

 

2 out of the 4 combinations work, so the probability is 1/2.

 Aug 4, 2018
 #2
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Thanks! I tend to get really confused on these types of problems, so your solution helped me!

Guest Aug 4, 2018

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