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The passage suggests which of the following about the illicit trade in CFC's?
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排列组合
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If 2 different representatives are to be selected at random from a group of 10 employees and if p is the probability that both representatives selected will be women, is $$p >\frac1 2$$ ?(1)More than $$\frac1 2$$ of the 10 employees are women.(2)The probability that both representatives selected will be men is less than $$\frac1 {10}$$.
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OG12
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For all integers n, the function f is defined by $${f}({n})={a}^{n}$$, where a is a constant. What is the value of $$f (1)$$?(1)$$f (2) = 100$$(2)$$f (3) = -1,000$$
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OG12 OG15 OG16 OG17
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Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persuaded n more people to donate $500 each to Mary's campaign. If no one donated more than once and if there were no other donations, what was the value of n?(1)The first n people donated $$\frac1 {16}$$ of the total amount donated.(2)The total amount donated was $120,000.
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What is the value of the integer k?(1)$$k + 3 > 0$$(2)$${k}^{4}\le{0}$$
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The results of a certain experiment included 6 data values that were all multiples of the same number c, namely, c, 8c, 2c, 5c, 4c, and 4c. Was the average (arithmetic mean) of the 6 data values greater than 8?(1)c < 4(2)c > 2
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OG12 OG15 OG16 OG17 OG18 OG19 OG20 OG2022
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 Each of the letters in the table above represents one of the numbers 1, 2, or 3, and each of these numbers occurs exactly once in each row and exactly once in each column. What is the value of r?(1)v + z = 6(2)s + t + u + x = 6
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In the xy-plane, what is the slope of line l?(1)Line l does not intersect the line with equation y = 1 - x.(2)Line l intersects the line with equation y = x - 1.
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If y is an integer and $${y}=\mid {x}\mid+{x}$$, is $$y = 0$$?(1)$${x}< {0}$$(2)$$y<1$$
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OG12 OG15 OG16 OG17 OG18 OG19 OG20 OG2022
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If x is negative, is $$x < -3$$?(1)$${x}^{2} >{9}$$(2)$${x}^{3}<-{9}$$
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OG12
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If m, p, and t are positive integers and m < p < t, is the product mpt an even integer?(1)t - p = p - m(2)t - m = 16
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If a, b, c, and d are positive integers, is $$(\frac {a} {b})(\frac {c} {d}) >\frac {c} {b}$$?(1)$$c > b$$(2)$$a > d$$
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If a certain machine produces bolts at a constant rate, how many seconds will it take the machine to produce 300 bolts?(1)It takes the machine 56 seconds to produce 40 bolts.(2)It takes the machine 1.4 seconds to produce 1 bolt.
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OG12 OG15 OG16 OG17
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A total of $60,000 was invested for one year. Part of this amount earned simple annual interest at the rate of x percent per year, and the rest earned simple annual interest at the rate of y percent per year. If the total interest earned by the $60,000 for that year was $4,080, what is the value of x?(1)$${x}=\frac {3y} {4}$$(2)The ratio of the amount that earned interest at the rate of x percent per year to the amount that earned interest at the rate of y percent per year was 3 to 2.
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Is $${x}^{2}+{y}^{2} >{6}$$?(1)$$({x}+{y})^{2} >{6}$$(2)$$xy = 2$$
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Of the cans of peaches inspected yesterday at a certain plant, 1.5 percent failed to pass inspection. Of the cans that failed inspection, $$\frac5 6$$ were incorrectly labeled and the rest were dented. If all of the cans that were incorrectly labeled or dented failed inspection, how many of the cans of peaches inspected yesterday at the plant were dented?(1)450 of the cans of peaches inspected yesterday at the plant failed to pass inspection.(2)29,550 of the cans of peaches inspected yesterday at the plant passed inspection.
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If n is an integer and $$100 < n <200$$, what is the value of n?(1)$$\frac n {36}$$is an odd integer.(2)$$\frac n {45}$$is an even integer.
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OG12 OG15 OG16 OG17 OG18 OG19 OG20 OG2022
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Material A costs $3 per kilogram, and material B costs $5 per kilogram. If 10 kilograms of material K consists of x kilograms of material A and y kilograms of material B, is x > y?(1)y > 4(2)The cost of the 10 kilograms of material K is less than $40.
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If Ann saves x dollars each week and Beth saves y dollars each week, what is the total amount that they save per week?(1)Beth saves $5 more per week than Ann saves per week.(2)It takes Ann 6 weeks to save the same amount that Beth saves in 5 weeks.
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数论
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If x is a positive integer, is the remainder 0 when $${3}^{x}+{1}$$ is divided by 10?(1)$$x = 4n + 2$$, where n is a positive integer.(2)$$x >4$$
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