Choose three numbers arbitrarily from 1, 2, 3, 4, 5, 6, 7, 8, 9 so that their sum is an even number, how many different choices are there?
从1，2，3，4，5，6，7，8，9中任意选出三个数，使它们的和为偶数，则共有多少种不同的选法．
<gadget id="calculator">40 + 4</gadget>
<output>44</output>

<result>44</result>