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Periodic Matrix

If A is uni m...

Question

If A is uni modular square matrix, then which of the following is not necessarily unimodular.

A^{- 1}

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adjA

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-A

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All the above

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Solution

The correct option is C -A
$| - A | = (- 1)^{n} | A | = {\begin{matrix} - 1 i f^{'} n^{'} i s o d d 1 i f^{'} n^{'} i s e v e n \end{matrix}$

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