CUET · MATHS · PYQ PAPER 2025

If \(A=\left[a_{i j}\right]\) is a square matrix of order 3 such that \(a_{i j}=i+j\) for all \(i, j\), then which of the following are correct?
(A) A is a skew-symmetric matrix
(B) A is a non-singular matrix.
(C) The inverse of A does not exist.
(D) A is a symmetric matrix.
Choose the correct answer from the options given below :

A (A), (B) and (C) only
B (B) and (D) only
C (A) and (C) only
D (C) and (D) only

Verified Solution

Answer & Solution

Correct Answer

(D) (C) and (D) only

Step-by-step Solution

Detailed explanation

\( A=\begin{bmatrix} 1+1 & 1+2 & 1+3 \\ 2+1 & 2+2 & 2+3 \\ 3+1 & 3+2 & 3+3 \end{bmatrix} = \begin{bmatrix} 2 & 3 & 4 \\ 3 & 4 & 5 \\ 4 & 5 & 6 \end{bmatrix} \) Since \( a_{ij} = i+j \) implies \( a_{ji} = j+i = i+j = a_{ij} \), A is a symmetric matrix. (D) is correct.…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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