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[" 15.A radioisotope "X" with a half lif...

[" 15.A radioisotope "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 "],[[" (a) "1.96times10^(9)" years "," (b) "3.92times10^(9)" years "],[" (c) "4.20times10^(9)" years "," (d) "8.40times10^(9)" years "],[" ( "]]

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