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[" A mixture consists of two radioactive materials "],[A_(1)" and "A_(2)" ,with half lives of "20" s and "10" s "],[" respectively.Intially the mixture has "40g" of "],[A_(1)" and "160g" of "A" .The amount of the "1%" in "],[" the mixture in ill hecome equal aller "],[[" (a) "60s," (b) "80s," (c) "20s," (d) "40s]]

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