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Let M be a 2 x 2 symmetric matrix wi...

Let M be a 2 x 2 symmetric matrix with integer entries . Then , M is invertible , if

A

the first column of M is the transpose of the second row of M

B

the second row of M is the transpose of the first column of M

C

M is a diagonal matrix with non-zero entries in the main diagonal

D

the product of entries in the main diagonal of M is not the square of an integer

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The correct Answer is:
C, D
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