For matrix A if AA^T = I, I is identity matrix then A is?(a) Orthagonalmatrix(b) Nilpotent matrix(c) Idempotent matrix(d) None of the mentionedThe question was posed to me in an international level competition.This intriguing question comes from Types of Matrices in chapter Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

For matrix A if AA^T = I, I is identity matrix then A is?(a) Orthagona

1.	For matrix A if AA^T = I, I is identity matrix then A is?(a) Orthagonalmatrix(b) Nilpotent matrix(c) Idempotent matrix(d) None of the mentionedThe question was posed to me in an international level competition.This intriguing question comes from Types of Matrices in chapter Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics
Answer» The CORRECT OPTION is (a) Orthagonalmatrix Best EXPLANATION: For orthagonal MATRICES AA^T = I = A^T A.

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