The half-life of radium is $1580 \ yrs$. Its average life will be:
- A$2.5 \times 10^{3} \ yrs$
- B$1.832 \times 10^{3} \ yrs$
- C$2.275 \times 10^{3} \ yrs$
- D$8.825 \times 10^{2} \ yrs$
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