GATE (TF) Textile 2010 Question Paper Solution | GATE/2010/TF/23

Question 23 (Textile Engineering & Fibre Science)

Cofactor of 'a' in the following determinant is \begin{vmatrix}3 & -4 & -3\\ 2 & 7 & a\\ 5 & -9 & 2\end{vmatrix}

(A)3
(B)5
(C)7
(D)9
[Show Answer]

Cofactor of a=(3 x -9-5x-4)

Cofactor of a=(-27+20)

Cofactor of a=-7

Determinant of cofactor of a=7 (Ans)

Option C is correct.

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