Teacher Li has 9 keys, 2 of which can open the door of the classroom. She randomly took out a key but couldn't open the door, and then randomly took another key to open the door. What is the probability that she can open the door this time?
李老师有9把钥匙，其中有2把可以打开教室的门．她任意取出了1把钥匙却打不开门，再任意取另1把钥匙去开门，这一次能打开门的可能性是多少？
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>