SAT数学题求解The integers 1 through 6 appear on the six faces of

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SAT数学题求解
The integers 1 through 6 appear on the six faces of a cube, one on each face. If three such cubes are rolled , what is the probability that the sum of the numbers on the top faces is 17 or 18? 答案是1/54,求思考过程和详细解释

三次的和为18只有一种情况,6+6+6=18
三次的和为17的有如下几种情况
6+6+5=17
6+5+6=17
5+6+6=17
所以一共是4种情况下可以得到17或者18
扔一次有6种情况,扔3次的话就是6*6*6=216种情况
所以满足条件的概率就是4÷216=1/54
再问：题目中不是说三个筛子一块扔吗，为什么还涉及到顺序问题？我觉得6，6，5；6，5，6和5，6，6是一种啊？
再答：骰子和骰子不一样，说是一起扔，其实还是相当于有顺序的

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