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<p>The solution to this equation is given in the previous section, where the sum of  is treated as a new total decay constant .</p>

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<p><b>Partial mean life</b> associated with individual processes is by definition the <a href="page.php?w=multiplicative_inverse">multiplicative inverse</a> of corresponding partial decay constant: . A combined  can be given in terms of s:</p>

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<p>This is the <a href="page.php?w=Harmonic_mean">Harmonic mean</a> of  and . Since half-lives differ from mean life  by a constant factor,</p><p>
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