Problem Rankings

Rank Source Description Elo Rating
1881 AMC 12 1989 A Q20 Let \(x\) be a real number selected uniformly at r... 1500.00
1882 AMC 12 1989 A Q21 A square flag has a red cross of uniform width wit... 1500.00
1883 AMC 12 1989 A Q22 A child has a set of \(96\) distinct blocks. Each ... 1500.00
1884 AMC 12 1989 A Q23 A particle moves through the first quadrant as fol... 1500.00
1885 AMC 12 1989 A Q24 Five people are sitting at a round table. Let \(f ... 1500.00
1886 AMC 12 1989 A Q25 In a certain cross-country meet between two teams ... 1500.00
1887 AMC 12 1989 A Q27 Let \(n\) be a positive integer. If the equation \... 1500.00
1888 AMC 12 1989 A Q29 Find \(\displaystyle \sum_{k=0}^{49}(-1)^k\binom{9... 1500.00
1889 AMC 12 1989 A Q30 Suppose that \(7\) boys and \(13\) girls line up i... 1500.00
1890 AMC 12 1990 A Q4 Let \(ABCD\) be a parallelogram with \(\angle ABC=... 1500.00
1891 AMC 12 1990 A Q7 A triangle with integral sides has perimeter \(8\)... 1500.00
1892 AMC 12 1990 A Q8 The number of real solutions of the equation \[|x-... 1500.00
1893 AMC 12 1990 A Q9 Each edge of a cube is colored either red or black... 1500.00
1894 AMC 12 1990 A Q10 An \(11\times 11\times 11\) wooden cube is formed ... 1500.00
1895 AMC 12 1990 A Q11 How man y positive integers less than \(50\) have ... 1500.00
1896 AMC 12 1990 A Q12 Let \(f\) be the function defined by \(f(x)=ax^2-\... 1500.00
1897 AMC 12 1990 A Q13 If the following instructions are carried out by a... 1500.00
1898 AMC 12 1990 A Q15 Four whole numbers, when added three at a time, gi... 1500.00
1899 AMC 12 1990 A Q16 At one of George Washington's parties, each man sh... 1500.00
1900 AMC 12 1990 A Q17 How many of the numbers, \(100,101,\ldots,999\), h... 1500.00