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OG18-数学分册	A certain university will select 1 of 7 candidates eligible to fill a position in the mathematics department and 2 of 10 candidates eligible to fill 2 identical positions in the computer science department. If none of the candidates is eligible for a position in both departments, how many different sets of 3 candidates are there to fill the 3 positions?
	Among a group of 2,500 people, 35 percent invest in municipal bonds, 18 percent invest in oil stocks, and 7 percent invest in both municipal bonds and oil stocks. If 1 person is to be randomly selected from the 2,500 people, what is the probability that the person selected will be one who invests in municipal bonds but NOT in oil stocks?
	The cost of operating an aircraft consists of landing and take-off costs of 1 thousand dollars per one landing and take-off and fuel costs of f dollars per mile flown. How much, in thousands of dollars, does it cost per week to operate an aircraft which makes one landing and take-off per day and flies m miles per week?
PREP07 Test 2	A contest will consist of n questions, each of which is to be answered either "True" or "False." Anyone who answers all n questions correctly will be a winner. What is the least value of n for which the probability is less than 1/1000 that a person who randomly guesses the answer to each question will be a winner?
Ready4	Each file folder at a company is marked with a 1-, 3-, or 5-digit code where each digit is selected from the digits 0 through 9, inclusive. If the digits may be repeated and if the same digits used in a different order represent a different code, how many different file folders can be marked with a unique code?
Ready4	[GMAT-Math-7213-q] Which of the following inequalities is an algebraic expression for the shaded part of the number line above?
	Pumping alone at their respective constant rates, one inlet pipe fills an empty tank to $$\frac{1}{2}$$ of capacity in 3 hours and a second inlet pipe fills the same empty tank to $$\frac{2}{3}$$ of capacity in 6 hours. How many hours will it take both pipes, pumping simultaneously at their respective constant rates, to fill the empty tank to capacity?
Ready4	Despite many peoples' impulse to go straight to the refrigerator, the best way to store an eggplant is the placing of it in a vented bowl, and, with intent to use it as soon as possible, it is kept in a cool spot away from direct sunlight.
Ready4	If $x>0$ and $16x^{4}=\left ( \frac{<font color='#FE8080'>1</font>}{16} \right )^{31}$ , what is the value of $x$ ?
Ready4	In a recent study published in Nature Neuroscience, a team of scientists, concluding that, since participants who took caffeine tablets in a memory test outperformed participants who took placebo tablets in that test, caffeine enhances short-term memory.
	The operation $$\bigodot$$ is defined for all nonzero numbers a and b by $$a \bigodot b =\frac a b-\frac b a$$. If x and y are nonzero numbers, which of the following statements must be true?I.$$x \bigodot xy = x(1 \bigodot y)$$II.$$x \bigodot y = -(y \bigodot x)$$III.$$\frac1 x \bigodot \frac1 y$$ =$$ y \bigodot x$$
PREP07 Test 1	Before being simplified, the instructions for computing income tax in Contry R were to add 2 percent of one's annual income to the average (arithmetic mean) of 100 unit of Contry R's currency and 1 percent of one's annual income. Which of the following represents the simplified formula for computing the income tax, in Country R's currency, for a person in that whose annual income is I?
190124	The price of 1kg salad is fixed. Someone took 9 dollars and went to the shop. Then, he found that he remembered a wrong price. The price he thought was $0.2/kg less than the actual price. As a result, the weight of the salad that he bought was 0.5 kg less than that in his mind. How much is the actual value of 1 kg salad?
Ready4	Sequence $S$ is composed of $n$ integers, where $n > <font color='#FE8080'>1</font>$ , whose arithmetic mean is $x$ . If each element of $S$ is multiplied by 3, the arithmetic mean of the resulting integers remains $x$ . Which statement(s) below must be true? $x=0$ The largest and smallest members of $S$ have the same absolute value. $S$ contains both positive and negative numbers.
OG18-数学分册	A square wooden plaque has a square brass inlay in the center, leaving a wooden strip of uniform width around the brass square. If the ratio of the brass area to the wooden area is 25 to 39, which of the following could be the width, in inches, of the wooden strip?I. 1II. 3III. 4
	The graphic displays results of an Internet survey on the effectiveness and popularity of various treatments for depression. The scale on the horizontal axis represents popularity, P, defined as the fraction of all respondents who tried the treatment; the scale on the vertical axis represents effectiveness, E, defined as the fraction of all respondents who considered a given treatment to be effective.On the basis of the information provided, select from each of the drop-down menus the option that creates the most accurate statement.The most effective treatment used by the greatest number of people is .Among the labeled treatments tried by more than half of the respondents, was the least effective.
PREP07 Test 2	For each country listed in the left column of the table, the number in the right column gives the number of units of Country X currency that is equivalent to 1 unit of the country's currency. Which of the following is equivalent to the greatest number of units of Country X currency?
191020	As shown in the figure, a semicircle is spliced with a rectangle. The rectangle is x in width and y in length. If the area of semicircle is 1/3 of the area of rectangle. What is the ratio of the arc of the semicircle to x?
OG17 OG18	Which one of the following statements is most strongly supported by the information presented in the tabs?
	Each increase of 1 percent in real disposable personal income per capita will increase the share of the electorate for an incumbent by about 2.2 percentage points, other things being equal. Since 1952 there has been a decline in real disposable income during only one presidential election year. The incumbent lost that election.Which of the following conclusions can be properly drawn from the statements above?