You have relatives coming for dinner this weekend.  The probability that your uncle Josiah will show up is 0.38, the probability that you aunt Beatrice will show up is 0.27, and the probability that both your uncle Josiah and your aunt Beatrice will show up is 0.1.  What is the probability that you will have either one (or both) of your relatives show up this weekend?  Enter your answer as a decimal, rounded to three decimal plac

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