# Matrices Question

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- Matrix A is the identity matrix
- [math]A_{1,1} < 0[/math]
- Matrix A has any elements equal to zero
- [math]det(A) = 0[/math]

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A square matrix A is NOT invertible (does not have an inverse) if which of the following is true?

- Matrix A is the identity matrix
- [math]A_{1,1} < 0[/math]
- Matrix A has any elements equal to zero
- [math]det(A) = 0[/math]

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