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  <title>fib (lib/librbdiscrete.rb)</title>
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  <pre><span class="ruby-comment cmt"># File lib/librbdiscrete.rb, line 247</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">fib</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-identifier">n</span>;
    <span class="ruby-keyword kw">elsif</span> 
        <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">fib</span>(<span class="ruby-identifier">n</span><span class="ruby-operator">-</span><span class="ruby-value">1</span>)<span class="ruby-operator">+</span><span class="ruby-identifier">fib</span>(<span class="ruby-identifier">n</span><span class="ruby-operator">-</span><span class="ruby-value">2</span>);
    <span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span></pre>
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