Teacher Li has 6 keys, 2 of which can open the door of the classroom. She randomly took 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6把钥匙，其中有2把可以打开教室的门．她任意取了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">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>