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In a radioactive sample of potassium nuclei either decay into stable calcium nuclei with decay constant 4.5x10^-10, or into stable argon nuclei with decay constant 0.5x10^-10 per year. Given that in this sample all the stable calcium and argon nuclei are produced by potassium nuclei only. In time tx10^9 years, the ratio of Ca/Ar=99 t=?

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