✓ 5 MARKS
Long Answer
🔥 APPEARED IN 3 BOARD SETS
(a) If $A = \begin{bmatrix} 1 & 2 & -3 \\ 2 & 0 & -3 \\ 1 & 2 & 0 \end{bmatrix}$, then find $A^{-1}$ and hence solve the following system of equations : $x + 2y - 3z = 1$, $2x - 3z = 2$, $x + 2y = 3$
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2024 | Series Other | Set 1 | Question 32 |
| CBSE 2024 | Series Other | Set 1 | Question 33 |
| CBSE 2024 | Series Other | Set 1 | Question 34 |
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)