There are three identical balls marked with numbers 1, 2, and 3 in the two opaque pockets, one ball is drawn randomly from each of the two pockets, and the sum of the numbers marked on the two balls drawn is What is the probability of being an odd number.
两个不透明的口袋中均有3个分别标有数字1，2，3的相同的球，分别从两个口袋中随机地各摸出一个球，摸出的两个球上所标数字之和为奇数的可能性大小是多少．
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">2 + 1 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>