Assuming a half-life of 1599 years, how many years will be needed for the decay of 15/16 of a given amount of radium-226?

1. 800 years

2. 4797 years

3. 7196 years

4. 5597 years

5. 2399 years

6. 6396 years

7. 3998 years

8. 3198 years

9. None of these

10. 1599 years

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