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  <question type="description">
    <name>
      <text>37.1.1.2 Permutations of ABCD</text>
    </name>
    <questiontext format="moodle_auto_format">
      <text><![CDATA[<hr>
<h4 class="HELM_example">Example</h4>
<p> Write out the possible permutations of the letters \(A, B, C\) and \(D\). </p>
<h4 class="HELM_solution">Solution</h4>
The possible permutations are 
\[\begin{matrix}ABCD&	ABDC&	ADBC&	ADCB	&ACBD&	ACDB\\
BADC&	BACD&	BCDA&	BCAD&	BDAC&	BDCA\\
CABD&	CADB&	CDBA&	CDAB&	CBAD&	CBDA\\
DABC&	DACB&	DCAB&	DCBA&	DBAC&	DBCA
\end{matrix}\]
There are \(4!=24\) permutations of the four letters \(A, B, C\) and \(D\).]]></text>
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