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I have a mathematics question that is tangentially related to fossil collecting. How do you figure out the total chance of rain during a collecting trip using the weather service rain predictions (should I bring my umbrella)? Can you give a general formula? Let us say that you are going on a three day trip with the following precipitation chances of measurable rain (chance of rain for any geographical point in forecast area) for each day: Friday 10%; Saturday 20% and Sunday 30%. What is the combined probability, Friday through Sunday, that it will rain at least once? Is rain likely? Assume tha