det(cA) = "c^n"det(A), where "n" is the dimension of the matrix (n rows, n columns).
det("A^T") = det(A) since transposing a matrix doesn't change its determinant.
So "det(3A^T)" = "3^ndet(A^T)=3^ndet(A)=3^n \\cdot 2=18, \\, 3^n=9," "\\,n=2."
Answer: the order of matrix "A" is 2.
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