Suppose we flip four coins simultaneously: a penny, a nickel, a dime, and a quarter.  What is the probability that at least 15 cents worth of coins come up heads?
Question:
Suppose we flip four coins simultaneously: a penny, a nickel, a dime, and a quarter.  What is the probability that at least 15 cents worth of coins come up heads?
Answer:
Let's think step by step.

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Suppose we flip four coins simultaneously: a penny, a nickel, a dime, and a quarter.  What is the probability that at least 15 cents worth of coins come up heads?
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