There are 1 yellow ball, 1 green ball, and 1 blue ball in a box. If 2 balls are drawn each time, what is the probability of drawing 1 blue ball and 1 green ball?
盒子里有1个黄球、1个绿球、一个蓝球，每次摸出2个球，摸到1个蓝球和1个绿球的可能性是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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