Put a total of 9 red balls, white balls and yellow balls in a box, draw a ball randomly, so that the probability of touching a yellow ball is (1/3), and the probability of touching a white ball is (4/9), then What is the probability of touching the red ball?
在盒子里放红球、白球和黄球共9个，任意摸出一个球，使摸到黄球的可能性是(1/3)，摸到白球的可能性是(4/9)，则摸到红球的可能性是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9 * (1/3)</gadget>
<output>3</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">9 * (4/9)</gadget>
<output>4</output>

<gadget id="calculator">9 - 3 - 4</gadget>
<output>2</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<result>2/9 = around 0.222222</result>