state gov JKSSB Account Assistant Mock Test 2023 Mathematics Matrices Types of Matrices

If \(A = \left[ {\begin{array}{*{20}{c}} 1&0&0\\ 0&1&0\\ a&b&{ - 1} \end{array}} \right]\), then A2 is a 

1
Unit matrix
2
Null matrix
3
A
4
-A
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