ISRO Computer Science (CSE) 2008 - Question 34

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If a square matrix A satisfies A^T A = I, then the matrix A is

  • A. Idempotent
  • B. Symmetric
  • C. Orthogonal
  • D. Hermitian

Answer: C. Orthogonal

Explanation: A matrix is orthogonal if A^T = A^-1, or A^T A = I.

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