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NDA Mathematics 18 April 2021
MCQ (Single Correct Answer)
+2.5
-0.83
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If A and B are square matrices of order 2 such that det(AB) = det(BA), then which one of the following is correct?
A
A must be a unit matrix.
B
B must be a unit matrix.
C
Both A and B must be unit matrices.
D
A and B need not be unit matrices.
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