2017年9月24日SAT官方每日一题---数学选择.

　　下面是2012年9月24日的SAT官方每日一题的内容，是关于数学方面的，题型是选择。SAT官方每日一题是collegeboard每天都会发布的题目，关于SAT考试的三个部分的各个题型。下面我们就一起来看一下这个SAT官方每日一题吧。

　　SAT官方每日一题之数学---选择：

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　　Mathematics > Standard Multiple Choice

　　Read the following SAT test question and then click on a button to select your answer.

　　When the positive integer n is divided by 5, the remainder is 0. What is the remainder when 3n is divided by 5?

　　(A) 0

　　(B) 1

　　(C) 2

　　(D) 3

　　(E) 4

　　The correct answer is A

　　Explanation

　　Choice (A) is correct. When the positive integer n is divided by 5, the remainder is 0. It follows that n is a multiple of 5. Therore, 3n is also a multiple of 5, and so the remainder when 3n is divided by 5 is likewise 0.

　　下面为大家提供一些和这些SAT官方每日一题相似的题目，供大家练习：

　　A 6-sided number cube, with faces numbered 1 through 6, is to be rolled twice. What is the probability that the number that comes up on the first roll will be less than the number that comes up on the second roll?

　　(A) 1 over 4

　　(B) 1 over 3

　　(C) 5 over 12

　　(D) 7 over 12

　　(E) 1 over 2

　　The correct answer is C

　　Explanation

　　The outcome space for this experiment is the set of all ordered pairs where represents the first number that comes up, and represents the second one. Since and can take all the values through , there will be a total of possible outcomes. The outcomes can be represented in a table as shown:　　　　Among all the pairs , are pairs for which . So remaining pairs will have . Notice that the number of pairs for which

is the same with the number of pairsfor which . Therore the number of pairsfor which , is (half of ). Then the probability that is equal to .

　　以上就是关于2012年9月24日SAT官方每日一题中数学部分的详细内容，包括了题目和选项以及答案，后面附有一道相关的练习题。大家可以在备考SAT的过程中关注SAT每日一题的内容，这样就可以更好有不间断的练习，也就能在日积月累的过程中得到提高。