GRE考满分·题库

搜索

GRE考满分·题库

搜索
科目分类：
全部 填空和等价 阅读和逻辑 数学
书籍分类：
全部 图表题专项练习 分难度套题练习 GRE数学6000题170逐考点专项练习 GRE数学170超高频“脏”题 GRE数学170超高频“坑”题 GRE数学170超高频“神”题
展开全部

题目列表

题目内容
$$a_k$$ = ($$\frac{1}{k} - \frac{1}{k+1}$$) for any positive integer k.

Quantity A

$$a_3$$+$$a_4$$+$$a_5$$+$$a_6$$+$$a_7$$

Quantity B

$$\frac{1}{8}$$
$$a_1$$=4, $$a_2$$=-3, $$a_3$$=7. If for any integer n greater than 3, $$a_n$$=$$|a_{n-1}-a_{n-2}|$$, then what`s the sum of all the terms from $$a_1$$ to $$a_{35}$$?
$$a_1$$=4, $$a_2$$=-3, $$a_3$$=7. If for any integer n greater than 3, $$a_n$$=|$$a_n$$-1-$$a_n$$-2|, then what`s $$a_{35}$$?
How many different positive three-digit integers are there that have an odd hundreds digit?
There are 2 different choices of Product A, 4 different choices of Product B and 5 different choices of Product C. In how many ways can these products be selected if either 1 or none of item is selected out of Product A, B, and C, respectively?
A team of two students from an art school is to be selected to represent the school at a national event. The two students will be selected from the students in three classes that have no students in common. The three classes have 10 students, 8 students, and 7 students. If the two students must be selected from different classes, how many teams are possible?
How many different positive three-digit integers are there that have an odd hundreds digit?
How many three-digit positive numbers are divisible by 5 and have a hundreds digit which is an odd number?
How many integers between 100 and 1,000 have a hundreds digit that is even, a tens digit that is odd, and a non-zero units digit that is divisible by 3?
In a gift box, there are three types of gifts: 4 yoyo balls of different designs, 4 toys of different colors, and 3 candy bars of different flavors. In how many ways can 3 gifts be selected such that each one is out of each type of gift?
If an integer is chosen at random from the integers between 101 and 550, inclusive, what is the probability that the chosen integer will begin with the digit 1, 2 or 3, and end with the digit 4, 5, or 6?
Among 350 card, cards No.100 to No.299 are red. Among all red cards, cards that end with 4, 5, 6, 7, 8, 9 and 0 are round. What is the probability that a red round card is selected when randomly selecting a card from all 350 cards?
Set A={1, 2, 3}

Set B={1, 2, 3, 4}

Quantity A

The number of different four-digit integers that can be formed by elements from Set A (all the elements can be used by more than once)

Quantity B

The number of different three-digit integers that can be formed by elements from Set B (all the elements can be used by more than once)
In a city, car plates are composed of 7 digits. Among them, the former digits should all be letters from the 26 alphabets, while the latter digits should all be numbers from 0 to 9.

x: The number of possible different car plates when choosing four letters(A-Z) and three numbers(0-9),numbers and letters can be used more than once.

y: The number of possible different car plates when choosing four letters(A-Z) and three numbers(0-9),numbers and letters can not be used more than once.

z: The number of possible different car plates when choosing three letters(A-Z) and four numbers(0-9),numbers and letters can be used more than once.

Quantity A

x-y

Quantity B

z
Among all the 24 different positive four-digit integers formed out of 6, 7, 8, 9, at which place will 8697 rank from the least to the greatest?
An artist has 3 hooks on the wall and 5 different pictures. How many different arrangements of 3 pictures can be formed if the artist puts one of the 5 pictures on each hook?

Quantity A

$$\frac{100!}{99!}$$

Quantity B

$$\frac{ (100!-99!)}{98!}$$

Quantity A

$$\frac{(5!+6!)}{(6!+7!)}$$

Quantity B

$$\frac{1}{6}$$

Quantity A

20!+19!+18!

Quantity B

400(18!)


Quantity A

$$\frac{23!}{(11!*13!)}$$

Quantity B

$$\frac{23!}{(10!*14!)}$$

共收录：

25000 +道题目

6本备考书籍

最新提问