【GRE考满分题库检索】GRE 题目搜索_等价和填空_阅读和逻辑_数学真题

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题目内容
To wake up in the morning, Doug sets two alarm clocks that operate independently of each other, in case one alarm clock fails to ring. If the probability that the first clock will ring is 0.95 and the probability that the second clock will ring is 0.90, what is the probability that neither alarm clock will ring? Give your answer as a decimal.
A teacher will assign a group project to 2 or more of the 4 students James, Kalla, Lomi, and Michelle. To how many different groups of students can the teacher assign the project?
There are 10 students, including Ann, Bob, Clive, and Dora, who are seated in 10 adjacent chairs arranged in a row. There are 5 students seated between Ann and Bob, 8 students seated between Bob and Clive, and 5 students seated between Clive and Dora. If Ann and Clive switch seats with each other, how many students will be seated between Clive and Dora?
The units digit of 2!+4!+6!+8!+10! Is
k is an integer greater than 1. Quantity A $$\frac{(k+1)!}{(k-1)!}$$ Quantity B (k)(k+1)
In a local election there are 2 candidates for mayor, 4 candidates for sheriff, and 5 candidates for dogcatcher on the ballot. In each of the three categories a voter may vote for exactly one candidate or none. How many different ways can a vote fill out the ballot?
A combination lock is set to open when the correct direction sequence is selected, either left-right-left or right-left-right, and when the correct three numbers from 1 to 60, inclusive, are selected in the correct order. If each number can be used only once, which of the following gives the number of different combinations that can be set to open the lock?
The figure shows two normal distributions, A and B, with means a and b, respectively. Quantity A The standard deviation of distribution A Quantity B The standard deviation of distribution B
Each day for 25 days, the number of people who used a certain library that day was recorded. The standard deviation of the 25 recorded numbers is 12. Which of the following statements individually provide(s) sufficient additional information to determine the mean of the 25 recorded numbers? Indicate all such statements.
The variance of n numerical data $$ x_{1}, x_{2}, x_{3}, ..., x_{n}$$, With mean $$\bar{x}$$ is equal to $$\sqrt{\frac{S}{n}}$$, where S is the sum of the squared differences $$(x_{i}-\bar{x})^{2}$$, for 1 ≤ i ≤ n. Data set R consists of n values and data set T consists of 2n values, where n is a positive integer. The means of the values in R and T are the same, and the variances of the values in R and T are 16 and 100, respectively. What is the variance of the values in the data set that consists of the values in R and the values in T?
List A: 1, 5, 9, 13, 4 List B: 1, 5, 9, 13, 9 List C: 1, 5, 9, 13, 7 List D: 1, 5, 9, 13, 6 The standard deviation of n numerical data $$ x_{1}, x_{2}, x_{3}, ..., x_{n}$$, With mean $$\bar{x}$$ is equal to $$\sqrt{\frac{S}{n}}$$, where S is the sum of the squared differences $$(x_{i}-\bar{x})^{2}$$, for 1 ≤ i ≤ n. Which of the following shows lists A, B, C, and D in order from the list with the least standard deviation to the list with the greatest standard deviation?
The standard deviation of the five values 2, 4, 6, 8, 10 is σ. For which of the following lists is the standard deviation of the values in the list equals to σ? Indicate all such lists.
List L consists of an odd number of consecutive integers. The median of the integers in L is 3. Which of the following statements must be true? Indicate all such statements.
The figure shows three circles. A, B, and C, that are tangent to each other. The area of circle A is equal to 1/16 of the area of circle B. The circumference of citele C is equal to the sum of the circumferences of circle A and circle B. If circle C has an area of 100π. what is the radius of circle A? Radius of circle A:__________
Quadrilateral ABCD is inscribed in the circle shown. What is the value of x+y? (Note: The measure of an angle inscribed in a circle is equal to half of the measure of the central angle that subtends the same arc.)
Quantity A The ones digit of $$208^{208}$$ Quantity B 7
If $$\frac{1}{x}$$+$$\frac{1}{y}$$=4.2 and $$\frac{1}{x}$$-$$\frac{1}{y}$$=3.5, what is the value of $$\frac{1}{x^{2}}$$-$$\frac{1}{y^{2}}$$?
If the length of each side of a regular hexagon is 6, what is the area of the regular hexagon?
Working alone at their respective constant rates, an outlet pump can empty a certain tank of water in 7 hours when the tank is initially full, and an inlet pump can fill the tank in 10 hours when the tank is initially empty. Beginning with a full tank, both pumps work simultaneously at their respective constant rates for 1 hour before the inlet pump is shut off. How many more hours would it take the outlet pump working alone to empty the tank?
In the figure, the line l and the x-axis are tangent to the circle at points P and S, respectively, and the line segment QS passed through center R of the circle. What is the slope of l?