OG19新题 题目总数：142 做题总人数：7893 平均准确率：74.7%
Let S be the set of all positive integers having at most 4 digits and such that each of the digits is 0 or 1 What is the greatest prime factor of the sum of all the numbers in S?
来源： 142人已做 其他难度 71.1%正确率
The table above shows the number of residents in each of two age groups who support the use of each type of funding for a city initiative. What is the probability that a person randomly selected from among the 250 residents polled is younger than 40, or supports a type of funding that indudes a tax, or both?
来源： 119人已做 其他难度 69.7%正确率
If n= p2 and p is a prime number greater than 5, what is the units digit of n2 ?
来源： 124人已做 其他难度 88.7%正确率
An 〝Armstrong number〞is an n-digit number that is equal to the sum of the nth powers ofits individual digits. For example, 153 is an Armstrong number because it has 3 digits and 13+53+33 =153 .What is the digit k in the Armstrong number 1, 6k 4?
来源： 130人已做 其他难度 76.2%正确率
Five integers between 10 and 99, indusive, are to be formed by using each of the ten digits exactly once in such a way that the sum of the five integers is as small as possible.What is the greatest possible integer that could be among these five numbers?
来源： 129人已做 其他难度 37.2%正确率
If the product of the integers w, x, y and z is 770, and if 1 ＜w＜x＜y＜z, what is the value of w+z?
来源： 127人已做 其他难度 90.6%正确率
If x＜y＜z and y-x>5, where x is an even integer and y and z are odd integers, what is the least possible value of z-x?
来源： 129人已做 其他难度 60.5%正确率
If Whitney wrote the decimal representations for the first 300 positive integer multiples of 5 and did not write any other numbers how many times would she have written the digit 5?
来源： 140人已做 其他难度 32.1%正确率
Of the following, which is greatest?
来源： 139人已做 其他难度 82.7%正确率
How many positive integers n have the property that both 3n and n/3 are 4-digit integers?
来源： 144人已做 其他难度 34%正确率
【OG20-P808-875题】According to recent studies comparing the nutritional value of meat from wild animals and meat from domesticated animals, wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is good for cardiac health.
The three women, liberal activists who strongly support legislation in favor of civil rights and environmental protection, have consistently received labor's unqualifying support.
【OG18-P692-732题】Laos has a land area about the same as Great Britain but only four million in population, where many are members of hill tribes ensconced in the virtually inaccessible mountain valleys of the north.
The results of two recent unrelated studies support the idea that dolphins may share certain cognitive abilities with humans and great apes; the studies indicate dolphins as capable of recognizing themselves in mirrors—an ability that is often considered a sign of self-awareness—and to grasp spontaneously the mood or intention of humans.
Countries that legalized the drug X twenty years ago, because a significant percentage of the population had been using X on a daily basis without any apparent harm to the community at large, reset the benchmark for what is appropriate and proper behavior among their citizens. Since X's legalization, there has been an increase in manic depression, suicide and certain kinds of cancer. In order for Andovia, a country that has not yet legalized X,to avoid the development of such undesirable tendencies and prevent the social problems stemming from broad usage of drug X, it should close its borders and not issue visas to any tourists from countries where drug X is legal.Which of the following, if true, most seriously weakens the argument above?
【OG20-P407-476题】Which of the following, if true, would most tend to weaken the conclusions drawn from "some of this research" ?
【OG20-P402-467题】The passage suggests that in the study mentioned in highlight the method for gathering information about security of land tenure reflects which of the following pairs of assumptions about Tawahka society?
Unlike using spices for cooking, in medicinal usage they are taken in large quantities in order to treat particular maladies.
【OG20-P401-466题】According to the passage, Tucci and Talaga found that service guarantees, when offered by lower-priced restaurants, can have which of the following effects?
【OG20-P798-825题】Many utilities obtain most of their electric power from large coal and nuclear operations at costs that are sometimes two to three times higher as that of power from smaller, more efficient plants that can both make use of waste heat and take advantage of the current abundance of natural gas.