In a radioactive element the fraction of intial amount remaining after its mean life time is (A)...

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In a radioactive element the fraction of intial amount remaining after its mean life time is
(A) \( 1-\frac{1}{\mathrm{e}} \)
(B) \( \frac{1}{\mathrm{e}^{2}} \)
(C) \( \frac{1}{\mathrm{e}} \)
(D) \( 1-\frac{1}{\mathrm{e}^{2}} \)
\( \mathrm{P} \)
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