{
  "ces_question_format": "1.0",
  "site": "math",
  "question_type": "matrix",
  "question_title": "Matrix product",
  "question_content": "Compute $AB$ for $A = \\begin{pmatrix} 1 & 2 \\\\ 0 & 1 \\end{pmatrix}$ and $B = \\begin{pmatrix} a & 0 \\\\ 1 & 1 \\end{pmatrix}$.",
  "question_variable": "a=2,3,4",
  "question_answer": "a+2, 2\n1, 1",
  "evaluation_method": 0,
  "score": 2
}