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A sample of radioactive nuclei of a certain element can decay only by - emission and 3-emission. If the half-life for -emission is 24

A sample of radioactive nuclei of a certain element can decay only by - emission and 3-emission. If the half-life for -emission is 24 minutes and that for 3-emission is 36 minutes, the half-life for sample is A. 30 minutes B. 24 minutes C. 20.8 minutes D. 14.4 minutes E. 6 minutes

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