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      <text>37.1.1.6 Example permutation take two at a time</text>
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      <text><![CDATA[<hr>
<h4 class="HELM_example">Example</h4>
<p>Find the number of permutations of the four letters \(A, B, C\) and \(D\) taken two at a time.</p>
<h4 class="HELM_solution">Solution</h4>
<p>We may choose the first letter in 4 ways and the second letter in 3 ways giving us 
\(\qquad
4\times 3=\dfrac{4\times 3\times 2\times 1}{1\times 2}=\dfrac{4!}{2!}=12\quad\) permutations]]></text>
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