A radioactive isotope X with a half-life of 1.37×109 years decays to Y which is stable. A sample of rock from the moon was found to contain both the elements X and Y which were in the ratio of 1 : 7. The age of the rock is
A) 1.96×108years
B) 3.85×109years
C) 4.11×109years
D) 9.59×109years
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c. is the correct answer
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