很多想要留学美国的同学们，都苦于无法快速搜集到大量有效的信息。啄木鸟小编专门为大家进行了信息整理，只要跟着小编的步伐，就可以事半功倍地掌握留学信息，取得高分，迈入名校哦!接下来，一起来看看吧!

　　排列 permutation(a : the act or process of changing the lineal order of an ordered set of objects b : an ordered arrangement of a set of objects)

　　组合 combination(an ordered sequence: as a : a sequence of letters or numbers chosen in setting a lock also : the mechanism operating or moved by the sequence b : a rapid sequence of punches in boxing c : any subset of a set considered without regard to order within the subset)

　　概率 probability, possibility

　　以上就是啄木鸟小编为同学们带来的文章，希望大家获得了自己想要知道的信息。祝同学们学习顺利、取得理想分数，拿到梦想的offer!