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ENTRANCE TEST – 2008 :: Discussion
| 52. | A certain radioactive mass decays from 64 gm to 2 gm in 20 days. What is its half-life? | |
| A. | 5 dayels. | |
| B. | 4 days. | |
| C. | 10 days. | |
| D. | 6 days. | |
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