There are 9 cards in the pocket, on which are written 1, 2, 3, 4, 5, 6, 7, 8, 9 respectively, now take out 8 cards at random, and calculate the sum of the numbers on the taken out cards, how many may this sum have situation.
口袋里有9张卡片，上面分别写着1、2、3、4、5、6、7、8、9，现在任意取出8张卡片，算出取出卡片上各数的和，这个和可能有多少种情况．
<result>9</result>