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A) \[{{A}^{2}}+5A-7I=O\]
B) \[{{A}^{2}}-5A+7I=O\]
C) \[{{A}^{2}}+7A-5I=O\]
D) \[{{A}^{2}}-7A+5I=O\]
E) None of these
Correct Answer: B
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