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The journey of every round
Every round-trip in the corpus is public. Open one to see the prompt, the zero-point index, the baseline response, the enhanced response, and how each grader read the difference. Leave a comment if a grader's reading lands — or doesn't.
Given f(x) = (x - 4) / 3, state the inverse function f^(-1)(x). Give the inverse in explicit form.
State the distributive law of intersection over union for three sets A, B, C. Give the identity in set notation.
State the formula for the volume of a sphere of radius r. Give the formula in exact form using pi.
Given the recursive sequence a_1 = 2 and a_(n+1) = 3 a_n - 1, compute a_4. Give the exact integer.
Compute the limit of the sequence a_n = (5n^2 + 2) / (2n^2 - n + 4) as n approaches infinity. Give the exact value.
Compute the sum of the arithmetic series 3 + 7 + 11 + ... + 99. Give the exact integer.
Compute the sum of the infinite geometric series 1 + 1/3 + 1/9 + 1/27 + ... Give the exact value.
Is the repeating decimal 0.999... equal to 1? State the exact value and justify using a geometric-series argument.
How many distinct arrangements are there of the letters in the word "STATISTICS"? Give the exact integer.
Compute the number of permutations of 9 distinct objects taken 4 at a time, P(9, 4). Give the exact integer.
Compute 7! (seven factorial). Give the exact integer.
Compute the binomial coefficient C(10, 4). Give the exact integer.
Compute the least common multiple of 30 and 45. Give the exact integer.
Compute 5^6 mod 11. Give the exact integer in the range 0 to 10.
State the smallest prime factor of 943. Give the exact integer.
Compute the greatest common divisor of 360 and 84 using the Euclidean algorithm. Give the exact integer.
A fair six-sided die is rolled twice. Compute the expected value of the sum of the two rolls. Give the exact value as a rational number.
A disease affects 2% of the population. A test is 90% sensitive and 95% specific. Someone tests positive. Compute the probability they actually have the disease. Give the exact value.
A prior P(H) = 0.3 and likelihood P(E|H) = 0.9, with P(E|not H) = 0.2. Compute the posterior P(H|E) using Bayes' theorem. Give the exact value.
State Bayes' theorem expressing P(A|B) in terms of P(B|A), P(A), and P(B). Give the formula.
Compute the limit of (x^2 - 9) / (x - 3) as x approaches 3. Give the exact value.
Evaluate the definite integral of (4x - 3) from x = 1 to x = 5. Give the exact value.
Differentiate h(x) = cos(5x^3 - 2x) using the chain rule. Give the exact derivative.
Evaluate the indefinite integral of 5x^4 + 2e^x with respect to x. Give the antiderivative and include the constant of integration.