✓ 1 MARKS
MCQ
🔥 APPEARED IN 3 BOARD 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
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2026 | Series 65-2 | Set 1 | Question 3 |
| CBSE 2026 | Series 65-2 | Set 2 | Question 14 |
| CBSE 2026 | Series 65-2 | Set 3 | Question 7 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- Step 1: Stating the fundamental formula / law statement (+1 Mark)
- Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
- Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)