<p>IF &nbsp;<span class="math-editor mathquill-rendered-math"><var>A</var><span class="binary-operator">=</span><span class="non-leaf"><span class="scaled paren" style="transform: scale(1, 1.05);">{</span>1,2,3,4,6<span class="scaled paren" style="transform: scale(1, 1.05);">}</span></span><var>B</var><span class="binary-operator">=</span><span class="non-leaf"><span class="scaled paren" style="transform: scale(1, 1.05);">{2,3,4,5,6</span><span class="scaled paren" style="transform: scale(1, 1.05);">} then find &nbsp;<span class="math-editor mathquill-rendered-math"><var>A</var><span class="binary-operator">&cap;</span><var>B</var></span> ?</span></span></span></p>