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This question has many correct answers. Instead of comparing the submission against a fixed correct answer, the grade() function in server.py checks whether the submitted matrix satisfies the required property (a determinant equal to a randomly chosen value). The stored correct answer is only one example of a valid answer, which is shown to students in the answer panel.

Demo: Custom grading for a question with many correct answers

Give an example of a $2\times 2$ matrix $A$ such that $\det(A) = -9$.

Correct answer

This question has many correct answers; the answer shown here is just one example.

$A = $ $\begin{bmatrix} -9 & 0\\ 0 & 1\\\end{bmatrix}$

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Title:
Demo: Custom grading for a question with many correct answers

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Started at:
2026-08-04 22:47:35 (CDT)
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{
  "A": {
    "_type": "ndarray",
    "_dtype": "int64",
    "_value": [
      [
        -9,
        0
      ],
      [
        0,
        1
      ]
    ]
  }
}
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