There are 2 red balls and 4 white balls in a pocket, draw a ball randomly, what is the probability of drawing a red ball?
口袋里有2个红球与4个白球，从中任意摸出一个球，摸到红球的可能性是多少．
<gadget id="calculator">2 + 4</gadget>
<output>6</output>

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

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