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Moderate

# Criterion for the Invertibility of a Matrix

LINALG-NNEWGY

Given the matrix:

$$M=\begin{pmatrix} a & b\\\ c &d \end{pmatrix}$$

...we can say:

A

$M$ is invertible if $a+d=0$

B

$M$ is invertible if $ad+bc=1$

C

$M$ is invertible if $ad-bc=1$

D

All of the above