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CUET · MATHS · PYQ PAPER 2025

Which of the following statements is/are true?
(A) \(B^T A B\) is a skew-symmetric matrix if \(A\) is symmetric matrix
(B) \(B^T A B\) is a symmetric matrix if \(A\) is symmetric matrix
(C) \(B^T A B\) is a symmetric matrix if \(A\) is skew-symmetric matrix
(D) \(B^T A B\) is a skew-symmetric matrix if \(B\) is skew-symmetric matrix
(E) \(B^T A B\) is a symmetric matrix if \(B\) is symmetric matrix
Choose the correct answer from the options given below :

  1. A (A) and (C) only
  2. B (A) and (E) only
  3. C (B) only
  4. D (D) and (E) only
Verified Solution

Answer & Solution

Correct Answer

(C) (B) only

Step-by-step Solution

Detailed explanation

Let \(X = B^T A B\). Then \(X^T = (B^T A B)^T = B^T A^T (B^T)^T = B^T A^T B\). If \(A\) is symmetric (\(A^T = A\)): \(X^T = B^T A B = X\). Thus, \(X\) is symmetric. Therefore, (A) is false and (B) is true. If \(A\) is skew-symmetric (\(A^T = -A\)):…