排列组合
排列数公式和组合数公式:
排列:
组合:
乘法原理:
一件事的完成可以分成n个步骤,完成其第一步有m1种方法,完成第二步有m2种方法完成第n步有mn种方法,那么完成这件事一共有N=m1m2mn种不同的方法。
例题.If all of the room numbers in a certain hotel must be even numbers, and if each of the numbers uses all four of the digits 3,4,5 and 8, what is the greatest number of four-digit numbers that the hotel can have?
例题.What is the total number of different 4-digit integers in which the units digit is an odd integer while the thousands digit is an even integer?
例题.What is the total number of different 5-digit numbers that contain all of the digits 1,2,3,4, and 5 and
1) in which none of the odd digits occur next to each other?
2) in which none of the even digits occur next to each other?
平时,建议大家一定要注意GRE数学基本概念的加强理解,因为无论GRE数学考试怎样的题目都是从最基本的概念中演变而来的。
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