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The half life of a radioactive isotopes ...

The half life of a radioactive isotopes 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

100 years

B

150 years

C

200 years

D

250 years

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