解析SAT数学中的概率题！

　　课窝SAT考试网的小编为大家总结了SAT数学考试的概率题的解析，在这里分享给大家，希望能对同学们有所帮助!

　　每年都有大量的学生选择去美国度过自己的大学生活，就有很多的人需要选择SAT这项入门考试。SAT的各科考试都需要同学们精心的准备。

　　各位考生需要注意的是，对于SAT数学概率题来说，你用的方法越简单，你做对的概率就越大。

　　(1)In the integer 3589 the digits are all different and increase from left to right. How many integers between 4000 and 5000 have digits that are all different and that increased from left to right?

　　比较题目：(2)In the integer 3589 the digits are all different and increase from left to right. How many integers between 30000 and 50000 have digits that are all different and that increased from left to right?

　　(3)If p, r, m are three different prime numbers greater than 2, and n=p*r* m, how many positive factors, including 1 and n, does n have?

　　比较题目：(4)If p, r, m, n, t and s are six different prime numbers greater than 2, and n=p*r*s*m*n*t, how many positive factors, including 1 and n, does n have?

　　(5)If someone throws a dice twice, on the first time he gets a points, and on the second he gets b points, what is the probability a/b>1?

　　比较题目：(6)If someone throws a dice twice, what is the probability that the point he gets on one throw is bigger than the other?

　　(7)Mr. Jones must choose 4 of the following 5 flavors of jellybean: apple, berry, coconut, kumquat, and lemon, How many different combinations of flavors can Mr. Jones choose?

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