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[" A radioactive isotope "X" with half-life of "6.93times10^(9)" years decay to Y which is stable.A sample of rock "],[" ram the moon was found to contain both the element "X" and "Y" in the mole ratio "1:7." What is the age of "],[" he rock? "],[[" 4) "2.079times10^(" to ")" years "," (B) "1.94times10^(" th ")" years "," (C) "1.33times10^(9)" years "," (D) "10^(" to ")" years "]]

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