There are 40 students in the class running for the position of principal and deputy monitor. What is the probability that each student can run for one of the positions?
全班40名同学竞选正、副班长职务，每位同学竞选上其中任一个职务的可能性是多少
<gadget id="calculator">2 / 40</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>