Put 9 identical small balls with numbers ①-⑨ written on them into a cloth bag, and touch any one of them. What is the probability of touching a small ball with an even number written on it?
把写有数字①-⑨的9个同样的小圆球放入布袋里，从中任意摸一个，摸到写有偶数的小圆球可能性是多少
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>