There are 4 white balls and 3 yellow balls in a box. Given 6 blue balls, what is the probability of drawing a ball out of them randomly to get a blue ball?
一个盒子中有4个白球，3个黄球．6个蓝球，任意从中摸出一个球摸到蓝球的可能性是多少．
<gadget id="calculator">4 + 3 + 6</gadget>
<output>13</output>

<gadget id="calculator">6 / 13</gadget>
<output>6/13 = around 0.461538</output>

<result>6/13 = around 0.461538</result>