There are 2 white ping-pong balls and 1 yellow ping-pong ball in an opaque box. Jia Jia touched 1 white ping-pong ball for the first time, and after putting it back, she was going to touch it for the second time. What is the probability that Jiajia will get a yellow table tennis ball when touching the ball for the second time?
一个不透明的盒子里放着2个白色乒乓球和1个黄色乒乓球，佳佳第一次摸出了1个白色乒乓球，放回去后准备摸第二次．第二次摸球，佳佳摸出黄色乒乓球的可能性是多少．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>