Use the nine numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9 to form three natural numbers with different digits. Each number can only be used once, and the numbers of the three numbers formed The sum is equal. So, how many different groups are there?
用1，2，3，4，5，6，7，8，9这九个数字组成三个位数互不相同的自然数，每个数字只能用一次，并且所组成的三个数的数字之和相等．那么，不同的组法共有多少种．
<gadget id="calculator">3 * 2 * 1 * 6</gadget>
<output>36</output>

<result>36</result>