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prealgebra intermediate

Problem

Suppose we flip four coins simultaneously: a penny, a nickel, a dime, and a quarter. What is the probability that they all come up heads?
Solution
There are possible outcomes, since each of the 4 coins can land 2 different ways (heads or tails). There is only 1 way that they can all come up heads, so the probability of this is .
Final answer
\dfrac{1}{16}