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: <math> log_e ( 1 - \frac{ i }{ c } ) \approx - \frac{ i }{ c } </math>
For ''p'' = 0.5 and ''p'' = 0.95 respectively the following estimates of ''n'' may be useful
<math> n = 1.2 \sqrt{ c } </math>
<math> n = 2.448 \sqrt{ c } \approx 2.5 \sqrt{ c } </math>
==Evaluation of indices==
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