Xiao Ming and 31 other students in the class write a greeting card each, put them together, and draw one from them, what is the probability of getting his own card?
小明与班上其他31个学生，每人写一张贺卡，放在一起，从中抽取一张，正好抽到自己那一张的可能性为多少．
<gadget id="calculator">1 + 31</gadget>
<output>32</output>

<gadget id="calculator">1 / 32</gadget>
<output>1/32 = around 0.03125</output>

<result>1/32 = around 0.03125</result>