A radio isotope X with a half life 1.4x109 yr decays of Y which is stable. A sample of the rock from a cave was found to contain X and Y in the ratio 1:7. The age of the rock is
(a)1.96x109 yr
(b)3.92x109 yr
(c)4.20x109 yr
(d)8.40x109 yr
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