The decay constant of a radioactive element is $3 \times 10^{-6} \ min^{-1}$. Its half-life is
- A$2.31 \times 10^5 \ min$
- B$2.31 \times 10^6 \ min$
- C$2.31 \times 10^{-6} \ min$
- D$2.31 \times 10^{-7} \ min$
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