If \[A=\left[ \begin{matrix} ab & {{b}^{2}} \\ -{{a}^{2}} & -ab \\ \end{matrix} \right]\]and \[{{A}^{n}}=O\], then the minimum value of n is

If \[A=\left[ \begin{matrix} ab & {{b}^{2}} \\ -{{a}^{2}}

1.	If \[A=\left[ \begin{matrix} ab & {{b}^{2}} \\ -{{a}^{2}} & -ab \\ \end{matrix} \right]\]and \[{{A}^{n}}=O\], then the minimum value of n is
A.	2
B.	3
C.	4
D.	5
Answer» B. 3

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If \[A=\left[ \begin{matrix} ab & {{b}^{2}} \\ -{{a}^{2}} & -ab \\ \end{matrix} \right]\]and \[{{A}^{n}}=O\], then the minimum value of n is

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