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What is the rank of a matrix?

  • A.the number of its non-zero entries
  • B.the sum of its diagonal entries
  • C.the order of its largest non-vanishing minor
  • D.the number of its rows

Answer: C

Equivalently it is the number of non-zero rows when the matrix is reduced to echelon form, and the two definitions always agree. It measures how many of the rows are genuinely independent, which is what governs the solvability of the associated system.

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