1.

Let M be a 2 × 2 symmetric matrix with integer entries. Them M is invertible if

Answer»

the first column of M is the transpose of the second row of M
the second row of M is the transpose of the first column of M
M is a diagonal matrix with NONZERO entries in the main diagonal
the product of entries in the main diagonal of M is not the SQUARE of an integer

Answer :C::D


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