The number of all \( 3 \times 3 \) matrices \( A \), with entries f...

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The number of all \( 3 \times 3 \) matrices \( A \), with entries from the set \( \{-1,0,1\} \) such that the sum of the diagonal elements
P of \( \mathrm{AA}^{\mathrm{T}} \) is 3 , is

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