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Linear AlgebraMediumRow Reduction & Rank

Row Reduction & Rank · Medium problem

What is the rank of M=(66−8266−82−12−1216−4)M = \begin{pmatrix}6 & 6 & -8 & 2 \\ 6 & 6 & -8 & 2 \\ -12 & -12 & 16 & -4\end{pmatrix}?