3 white balls, 2 red balls, and 1 green ball are placed in a box, and one is drawn from it, what is the probability of drawing a red ball
一个盒子中放入3个白球，2个红球，1个绿球，从中摸出一个，摸到红球的可能性是多少
<gadget id="calculator">2 + 3 + 1</gadget>
<output>6</output>

<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

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