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Two rocks are found that have different ratios R' of 238U to 206Pb: R' = 0.59...

Two rocks are found that have different ratios R' of 238U to 206Pb: R' = 0.59 and 2.1. What are the ages of the two rocks?
_____ y (R' = 0.59)
_____ y (R' = 2.1)

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