OG19新题 题目总数：142 做题总人数：7904 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?
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It can be inferred from the passage that the author believes which of the following about women's relationship to politics in the nineteenth-century United States?
【OG20-P178-212题】What is the difference between the sixth and the fifth terms of the sequence 2, 4, 7,... whose nth term is n + 2n-1?
【OG20-P176-198题】 In a certain sequence, the term xn is given by the formula xn=2xn−1−12 (xn−2) for all n≥2 . If x0 =3 and x1 = 2, what is the value of x3 ?
【OG20-P176-196题】If [x] is the greatest integer less than or equal to x, what is the value of [-1.6]+[3.4]+[2.7] ?
【OG20-P175-189题】 If pq <1 , and p and q are positive integers, which of the following must be greater than 1 ?
【OG20-P175-186题】David has d books, which is 3 times as many as Jeff and 1/2 as many as Paula. How many books do the three of them have altogether, in terms of d ?
【OG20-P174-183题】The graph of which of the following equations is a straight line that is parallel to line ℓ in the figure above?
【OG20-P173-177题】In the figure shown, if the area of the shaded region is 3 times the area of the smaller circular region, then the circumference of the larger circle is how many times the circumference of the smaller circle?
【OG20-P173-176题】If n = 38- 28, which of the following is NOT a factor of n?
【OG20-P171-163题】Each year for 4 years, a farmer increased the number of trees in a certain orchard by 1/4 of the number of trees in the orchard the preceding year. If all of the trees thrived and there were 6,250 trees in the orchard at the end of the 4-year period, how many trees were in the orchard at the beginning of the 4-year period?