Which Matrices Are Invertible?

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Solution

Invertible Matrices:
Invertible matrices are those which follow this relation,
$A B = B A = I$ , where $I$ is an identity matrix. Therefore we called $A$ and $B$ are invertible matrices.
An invertible matrix is a square matrix.
An invertible matrix is also called a nonsingular matrix.
Non-singular matrices are those matrices whose determinant is non-zero.

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