The radioactive isotope X with a half-li...

The radioactive isotope X with a half-life of `10^(9)` decays to Y which is stable. A sample of rocks was found to contain both the elements X and Y in the years ratio `1: 7`. If initially, the quantity of Y in the rock was zero, then the age of the rocks is

`2xx10^(9)yr`

`3xx10^(9)yr`

`6xx10^(9)yr`

`7xx1^(9)yr`

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