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A rock contains 0.275 mg of lead-206 for each milligram of uranium-238, The half-life for the decay of uranium-238 to lead-206 is 4.5 x 10*9 yr. The rock was formed_________yr ago. 1.42 x 10*9 9.62 x 10*8 1.24 x 10*9 1.79 x 10*9 1.39 x 10*9