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Question

If A is a skew-symmetric matrix and n is an even natural number, write whether An is symmetric or skew-symmetric or neither of these two.

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Solution

If A is a skew-symmetric matrix, then AT=-A.AnT=ATn For all nNAnT=-An AT=-A AnT=-1n AnAnT=An, if n is even or -An, if n is odd.

Hence, An is symmetric when n is an even natural number.

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