There are 3 cars, the quality is divided into excellent, medium, and inferior. Now someone is waiting for a car at the intersection. The above three cars will come one after another, but they don't know the order. It's a premium car. May I ask, what strategy should passengers adopt in order to take the best car as much as possible? What is the probability (possibility) of getting on a premium car?
有3辆车，质量分为优等、中等、下等．现在有人在路口等车，上述3辆车会一辆接一辆开过来，但不知顺序如何，乘客只能分辨开到的车与前面开过去的车谁好谁差，而不知哪辆车才是优等车．请问，乘客为了尽可能乘上优等车，该采用何种策略？乘上优等车的概率(可能性)是多少？
<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>