A rock contains 0.413 mg of lead-206 for each milligram of uranium-238. The 
for the decay of uranium-238 to lead-206 is 4.5 × 109 y. The rock was formed ________ y. ago.
A) 4.80 × 109
B) 1.86 × 109
C) 3.10 × 109
D) 7.34 × 109
E) 2.53 × 109
Correct Answer:
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