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!

Guest Aug 3, 2018
edited by Guest  Aug 3, 2018

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.

Jz1234  Aug 4, 2018

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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