alleryA square matrix A is symmetric if:
AA = A⁻¹
BA = Aᵀ
CA = -A
Ddet(A) = 1
Answer & Solution
Correct answer: B. A = Aᵀ
**Symmetric:** A = Aᵀ.
Means a_ij = a_ji for all i, j.
**Skew-symmetric:** A = -Aᵀ.
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