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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

100 years

B

150 years

C

200 years

D

250 years

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The correct Answer is:
C
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