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Let M be a 2xx2 symmetric matrix with in...

Let M be a `2xx2` symmetric matrix with integer entries.
Then , M is invertible, if

A

the first column of M is the tranpose 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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