There are 10 red balls and 7 yellow balls in a pocket, which are identical except for their colour. What is the probability of drawing a yellow ball from it?
口袋里有10个红球和7个黄球，它们除颜色外完全相同．从中摸出一个球，摸出黄球的可能性是多少
<gadget id="calculator">10 + 7</gadget>
<output>17</output>

<gadget id="calculator">7 / 17</gadget>
<output>7/17 = around 0.411765</output>

<result>7/17 = around 0.411765</result>