There are 4 white balls, 2 red balls, and 1 yellow ball in a box. If one ball is drawn randomly, the probability that the ball is not white is ((())/(())).
一个箱子里有4个白球、2个红球、1个黄球，任意摸出一个，摸出不是白球的可能性是((())/(()))．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">4 + 2 + 1</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>