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` first matrix second matrix`

a b c 1 0 0 = 1 0 0 r s t

d e f 0 1 0 = 0 1 0 u v w

g h i 0 0 1 = 0 0 1 x y z

Find the inverse of matrix A, listed below, using this technique.

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` 2 3 -1`

A= 4 2 1

1 3 5

verify that you have the inverse by using the property that AA to the power of -1=1