[" 67.If "A" is a square matrix such tha...

[" 67.If "A" is a square matrix such that "A-A^(T)=0," then which "],[" one of the following is correct? "],[" (a) "A" must be a null matrix "],[" (b) "A" must be a unit matrix "],[" (c) "A" must be a scalar matrix "]

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