OG19新题 题目总数：142 做题总人数：7910 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： 144人已做 其他难度 70.1%正确率
来源： 110人已做 其他难度 41.8%正确率
来源： 107人已做 其他难度 86%正确率
来源： 109人已做 其他难度 69.7%正确率
来源： 105人已做 其他难度 69.5%正确率
来源： 105人已做 其他难度 97.1%正确率
来源： 111人已做 其他难度 88.3%正确率
来源：GWD–TN24套 、破解版07 、Manhattan 、破解版08 、破解版12 、精选题库 、测评题 107人已做 其他难度 86.9%正确率
来源： 112人已做 其他难度 69.6%正确率
来源： 113人已做 其他难度 24.8%正确率
It was only after Katharine Graham became publisher of The Washington Post in 1963 that it moved into the first rank of American newspapers, and it was under her command that the paper won high praise for its unrelenting reporting of the Watergate scandal.
【OG20-P289-408题】At a bakery, all donuts are priced equally and all bagels are priced equally. What is the total price of 5 donuts and 3 bagels at the bakery?(1) At the bakery, the total price of 10 donuts and 6 bagels is $12.90.(2) At the bakery, the price of a donut is $0.15 less than the price of a bagel.
Recent breakthroughs in technology have made it possible that high-definition digital video cameras are able to capture material with a degree of fidelity that nearly compares to 35-millimeter film and to project it digitally in theaters with no resulting loss of image quality.
In the major cities of industrialized countries at the end of the nineteenth century, important public places such as theaters, restaurants, shops, and banks had installed electric lighting, but electricity was in less than one percent of homes, where lighting was still provided mainly by candles or gas.
Since 1975 so many people have been moving to Utah such that Mormons who were once 75 percent of the population are now only accounting for half of it
【OG20-P284-355题】Jill has applied for a job with each of two different companies. What is the probability that she will get job offers from both companies?(1) The probability that she will get a job offer from neither company is 0.3.(2) The probability that she will get a job offer from exactly one of the two companies is 0.5.
Evolutionary psychology holds that the human mind is not a "blank slate," but instead that it comprises specialized mental mechanisms that were developed as a way of solving specific problems human ancestors faced millions of years ago.
By recording the noise of crinkled wrappers as they were slowly stretched out in an otherwise silent chamber, and then digitizing and analyzing the sound emissions on computers, a team of scientists found the noise not continuous but consisted of individual bursts or pops just thousandths of a second long.
As a result of a supernova explosion, every human being on Earth was bombarded on February 23, 1987, by about 100 billion neutrinos; fortunately, neutrinos are harmless elementary particles that are produced in nuclear reactions and that interact very weakly with matter.
【OG20-P281-329题】A six-sided mosaic contains 24 triangular pieces of tile of the same size and shape, as shown in the figure above. If the sections of tile fit together perfectly, how many square centimeters of tile are in the mosaic.1.Each side of each triangular piece of tile is 9 centimeters long.2.The mosaic can be put inside a rectangular frame that is 40 centimeters wide.