There are 36 poker cards on Xiao Ming's table, all of which are face down. His classmates told him that 2 of them are old K, but Xiao Ming doesn't know which one is old K. Now take any one of them, what is the probability that he turns over the old K?
在小明桌上放有36张扑克牌，全部正面朝下，同学们告诉他，其中有2张是老K，但是小明不知道哪张是老K．现在任意取其中的一张，他翻开是老K的可能性是多少
<gadget id="calculator">2 / 36</gadget>
<output>1/18 = around 0.055556</output>

<result>1/18 = around 0.055556</result>