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  <title>factorial (lib/librbdiscrete.rb)</title>
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  <pre><span class="ruby-comment cmt"># File lib/librbdiscrete.rb, line 22</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">factorial</span>( <span class="ruby-identifier">n</span> )
    <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">n</span> <span class="ruby-operator">&lt;=</span> <span class="ruby-value">1</span>
        <span class="ruby-keyword kw">return</span> <span class="ruby-value">1</span>
    <span class="ruby-keyword kw">else</span>
        <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">n</span><span class="ruby-operator">*</span><span class="ruby-identifier">factorial</span>( <span class="ruby-identifier">n</span><span class="ruby-operator">-</span><span class="ruby-value">1</span> ).<span class="ruby-identifier">to_i</span>
    <span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span></pre>
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