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The half-life of a radioactive isotope X...

The half-life of a radioactive isotope X is 50 years . It decays to another element Y which is stable . The two elements X and Y were found to be in the ratio of 1:15 in a sample of a given rock. The age of the rock was estimated to be

A

150 years

B

200 years

C

250 years

D

100 years

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The correct Answer is:
B
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