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In the uranium ore, the ratio of U^(238)...

In the uranium ore, the ratio of `U^(238)` nuclei to `Pb^(206)` nuclei is `2.8`. If it is assumed that all the lead `Pb^(206)` to be a final decay product of the uranuium series, the age of the ore is `[T_(1//2)` for `U^(238)` is `4.5xx10^(9)` years]

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The correct Answer is:
[About `2xx10^(9)` years]
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