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[" Half-lives of two radioactive elements "A" and "B" are "20" minutes and "40" minute "],[" nithly,the samples have equal number of nuclei.After "80" minutes,the ratio of de "],[" of A and B nuclei will be: "],[[" (A) "x:1," (B) "1:4],[" (9) "5:4," (D) "1:16]]

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