There are 42 students in the third class of the sixth grade. In the final examination, (1/3) of the students got "excellent", (1/2) of the students got "good", (1/6) of the students got "pass", How many people failed?
六年级三班有42名同学，在期末检测中，(1/3)的同学得"优"，(1/2)的同学得"良"，(1/6)的同学得"及格"，不及格的有多少人？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/3) + (1/2) + (1/6)</gadget>
<output>1</output>

<gadget id="calculator">42 * 1</gadget>
<output>42</output>

<gadget id="calculator">42 - 42</gadget>
<output>0</output>

<result>0</result>