Matrix calculus: Rank and inverse of a matrix
Invertibility and rank
Is the following matrix invertible?
\[
\matrix{
1 &4 & 2 \\
-1 &-20 &-6 \\
-1 &-4 &-18}
\]
\[
\matrix{
1 &4 & 2 \\
-1 &-20 &-6 \\
-1 &-4 &-18}
\]
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