Matrix for which LU decomposition is not possible?
1
\(A = \left[ {\begin{array}{*{20}{c}} 2&0\\ 0&1 \end{array}} \right]\)
2
\(A = \left[ {\begin{array}{*{20}{c}} 1&0\\ 3&1 \end{array}} \right]\)
3
\(A = \left[ {\begin{array}{*{20}{c}} 1&1\\ 0&1 \end{array}} \right]\)
4
\(A = \left[ {\begin{array}{*{20}{c}} 0&2\\ 3&1 \end{array}} \right]\)