UPSC NDA I 2021 Mathematics Solved Paper

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Question : 59 of 120

Marks: +1, -0

If A and B are square matrices of order 2 such that det(AB)=det(BA), then which one of the following is correct?

[NDA-I 2021]

A must be a unit matrix.
B must be a unit matrix.
Both A and B must be unit matrices.
A and B need not be unit matrices.

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