There are 10 balls of the same size in a pocket, 7 red balls and 3 white balls, one ball is randomly drawn from the pocket. What is the probability of touching the white ball.
口袋里有大小相同的10个球，7个红球，3个白球，从口袋中任意摸出1个球．摸到白球的可能性是多少．
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>