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Which of the following matrices is LU DECOMPOSIBLE? How to find it?

  1. $\begin{bmatrix} 1 & 2 & 3 \\ 2 & 4 & 5 \\ 1 & 3 & 4 \end{bmatrix}$
  2. $\begin{bmatrix} 3 & 2 \\ 0 & 1 \end{bmatrix}$
  3. $\begin{bmatrix} 0 & 1 \\ 3 & 2 \end{bmatrix}$
  4. $\begin{bmatrix} 1 & -3 & 7 \\ -2 & 6 & 1 \\ 0 & 3 & -2 \end{bmatrix}$
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