owing table, <span class="emphasis"><em>p</em></span> is the probability that
          any one trial will be successful (the success fraction), <span class="emphasis"><em>r</em></span>
          is the number of successes, <span class="emphasis"><em>k</em></span> is the number of failures,
          <span class="emphasis"><em>p</em></span> is the probability and <span class="emphasis"><em>q = 1-p</em></span>.
        </p>
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