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[" The half - life of a radioisotope is ...

[" The half - life of a radioisotope is four hours.If the initial mass of the isotope was "200" g,the mass "],[" remaining after "24" hours undecayed is: "],[[" (1) "1.042g," (2) "2.084g," (3) "3.125g," (4) "4.167g" ."]]

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