combinatorial probability

例句：

1. 1. In combinatorial probability, we needto consider all possible combinations of elements.
   在组合概率中，我们需要考虑所有可能的元素组合。
2. 2. The combinatorial probabilityof a coin landing heads is 0.5.
   硬币落地正面的概率是0.5。
3. 3. The combinatorial probability ofa sequence of events is the product ofthe individual probabilities.
   事件序列的组合概率是各个独立事件概率的乘积。