Q32 of 98 Page 314

The matrix A=is

Here the diagonal value is 2+3-3= 1

So the given matrix is idempotent.

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If A=then A-1=?

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The matrix A=is

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If A is singular then A(adjA)=?

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For any 2-rowed square matrix A, if A(adjA) = then the value of │A│ is