A television weather forecaster once said that there was a 50 percent chance of rain on Saturday

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A television weather forecaster once said that there was a 50 percent chance of rain on Saturday and a 50 percent chance of rain on Sunday, and therefore a 100 percent chance of rain that weekend. Explain the error in this reasoning. If there is a 40 percent chance that it will rain on both Saturday and Sunday, what is the probability that it will rain on at least one of these two days?

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