For matrices of same dimension M N and scalar c which...

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For matrices of same dimension M, N and scalar c, which one of these properties DOES NOT ALWAYS hold?

A. (M^T)^T = M

B. (cM)^T = c(M)^T

C. (M + N)^T = M^T + N^T

D. MN = NM

Answer: Option D

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