Appeared in: 2026 (3 sets)
If $A = \begin{bmatrix} 1 & a & b \\ -1 & 2 & c \\ 0 & 5 & 3 \end{bmatrix}$ is a symmetric matrix, then the value of $3a + b + c$ is
(A) $2$
(B) $6$
(C) $4$
(D) $0$
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Official Evaluation Steps & EL10 Insight
Step 1 (Formula / Governing Law & Given Data): [½ Mark]
Given matrix: