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On each of the first three days of January, there is a $\frac{1}{3}$ chance that it will snow where Bob lives. On each of the next four days, there is a $\frac{1}{4}$ chance that it will snow. What is the probability that it snows at least once during the first week of January?

 Jul 12, 2021
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The probability is 25/32.

 Aug 15, 2021

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