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!

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.

Thanks! I tend to get really confused on these types of problems, so your solution helped me!