and Aij
is cofactor of aij, then value of 
is given
by
(a) a11 A31
+ a12 A32 + a13A33
(b) a11A11+
a12A21 + a13A31
(c) a21 A11
+ a22 A12 + a23 A13
(d) a11 A11
+ a21 A21 + a31 A31
Answer:
Since
sum of the
product of elements of any row (or column) with their corresponding cofactors,
so 
Therefore
(D) is true.
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