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[" A radio isotope "X" " with a half lif...

[" A radio isotope "X" " with a half life "1.4times10^(9)" years "],[" decays to '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 : "],[" (1) "1.96times10^(9)" years "],[" (2) "3.92times10^(9)" years "],[" (3) "4.20times10^(9)" years "],[" (4) "8.40times10^(9)" years "]

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