Which of the following matrices is not diagonalizable over ℝ ?
1
\(\left(\begin{array}{lll} 2 & 0 & 1 \\ 0 & 3 & 0 \\ 0 & 0 & 2 \end{array}\right)\)
2
\(\left(\begin{array}{ll} 1 & 1 \\ 1 & 1 \end{array}\right)\)
3
\(\left(\begin{array}{lll} 2 & 1 & 0 \\ 0 & 3 & 0 \\ 0 & 0 & 3 \end{array}\right)\)
4
\(\left(\begin{array}{cc} 1 & -1 \\ 2 & 4 \end{array}\right)\)
5
Question Not Attempted