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A symmetric matrix is a one in which?

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A symmetric matrix is a one in which?

(a) All diagonal elements are zero

(b) All diagonal elements are 1

(c) A = A^T

(d) A = -A^T

This question was addressed to me in an online interview.

My question is based upon Types of Matrices topic in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Correct answer is (c) A = A^T

The explanation: For symmetric matrices, matrix remains same even after transpose.

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