In the math test of class 6 and 2, the students who got excellent grades accounted for (1/7), the students who got good grades accounted for (1/3), and the students who passed the exam accounted for (1/2). There are less than 50 students in this class, so the students who failed how many people?
六2班数学考试，得优的同学占(1/7)，得良的同学占(1/3)，及格的同学占(1/2)，这班学生不足50人，那么不及格的学生有多少人？
<gadget id="calculator">7 * 3 * 2</gadget>
<output>42</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<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 - (1/7) - (1/3) - (1/2)</gadget>
<output>1/42 = around 0.02381</output>

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

<result>1</result>