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[" At a given instant,"60%" of the radio...

[" At a given instant,"60%" of the radioactive nu "],[" a sample are left undecayed.After "20s" ,"85%],[" have disintegrated,mean life of nuclei "],[[" 1) "10s," (2) "6.93s],[" (3) "14.43s," (4) "12.86s]]

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