62.
Which one of the following statements is NOT true for a square matrix A?

64.
Given a system of equations:
x + 2y + 2z = b1
5x + y + 3z = b2
Which of the following is true regarding its solution?

65.
The matrix \[\left( {\begin{array}{*{20}{c}} 2&{ - 4} \\ 4&{ - 2} \end{array}} \right)\]  has

66.
The inverse of the matrix \[\left[ {\begin{array}{*{20}{c}} 2&3&4 \\ 4&3&1 \\ 1&2&4 \end{array}} \right]\]  is

67.
The condition for which the eigen values of the matrix \[{\text{A}} = \left[ {\begin{array}{*{20}{c}} 2&1 \\ 1&{\text{k}} \end{array}} \right]\]   are positive, is

68.
Given that the determinant of the matrix \[\left[ {\begin{array}{*{20}{c}} 1&3&0 \\ 2&6&4 \\ { - 1}&0&2 \end{array}} \right]\]  is -12, the determinant of the matrix \[\left[ {\begin{array}{*{20}{c}} 2&6&0 \\ 4&{12}&8 \\ { - 2}&0&4 \end{array}} \right]\]  is

69.
For the matrix \[{\text{A}} = \left[ {\begin{array}{*{20}{c}} 5&3 \\ 1&3 \end{array}} \right],\]   ONE of the normalized eigen vectors is given as

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