During mean life of a radioactive element, the fraction that disintegrates is [J \& K CET 2010; ...

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During mean life of a radioactive element, the fraction that disintegrates is
[J \& K CET 2010; Similar KCET 2009]
(a) \( e \)
(b) \( \frac{1}{e} \)
(c) \( \frac{e-1}{e} \)
(d) \( \frac{e}{e-1} \)
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