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counting and probability intermediate

Problem

If the odds for pulling a prize out of the box are , what is the probability of not pulling the prize out of the box? Express your answer as a common fraction.
Solution
If the odds for pulling a prize out of the box are , that means that 3 out of 7 times will result in a prize, while 4 out of 7 times will not. So the probability of not pulling the prize out of the box is .
Final answer
\frac{4}{7}