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The number of matrices X with entries {0...

The number of matrices X with entries `{0,2,3}` for which the sum of all the principal diagonal elements of `X.X^(T)` is 28 (where `X^(T)` is the transpose matrix of X), is

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The total number of 3 xx 3 matrices A having entries from the set {0,1,2,3} such that the sum of all the diagonal entries A ^(T)A is 9, is equal to "________"