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Under what condition does a square matrix possess an inverse?

  • A.its determinant is non-zero
  • B.its determinant is zero
  • C.its trace is non-zero
  • D.it is symmetric

Answer: A

The inverse is the adjoint divided by the determinant, so a zero determinant leaves the expression undefined. Such a matrix is called singular, and the linear system it represents has either no solution or infinitely many rather than a unique one.

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