【SAT数学】概率论难题精讲

小站整理2015-03-05 14:49:29

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摘要：各位考生一定要注意，对SAT数学来说，你用的方法越简单，你做对的概率越大，而且还可以在考场上省出很多时间来做更有意义的事情。

各位考生一定要注意，对SAT数学来说，你用的方法越简单，你做对的概率越大，而且还可以在考场上省出很多时间来做更有意义的事情。

下面我们就对SAT数学概率论部分的常用解题技巧进行总结，以期事半功倍：

(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?