Answer:
Cofactor
of element 2 = A21
=
(?1)4 (15 ? 8) = 7
Cofactor
of element 1 = A23 = (?1)2+3 
=
(?1)5 (10 ? 3) = ?7
As
we know that
sum of
the product of elements of any row (or column) with their corresponding
cofactors
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