Given det det det a b c 7 7 7 de f ghi a b c + 7 7 7 def def gh i + a b c def ghi = 11 1 9 8 = 9, find

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A: Explanation of the answer is as follows

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A: Let  V the subspace of Rn, then the orthogonal complement of V is also subspace of Rn .

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