Two rocks are found that have different ratios R' of 238U to 206Pb: R' = 0.76 and 3.1. What are the ages of the two rocks? Did they likely have the same origin?

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Two rocks are found that have different ratios R' of 238U to 206Pb: R' = 0.76 and 3.1. What are the ages of the two rocks? Did they likely have the same origin?

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