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NDA Math Determinants

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Consider the following for the next three (03) itcms that follow:
Let ∆ be the determinant of a matrix A, where A=(

a11	a12	a13
a21	a22	a23
a31	a32	a33

) and C11,C12,C13 be the cofactors of a11,a12,a13 respectively.

[NDA II 2022]

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Question : 2

Total: 68

What is the value of a11C11+a12C12+a13C13 ?

0
1
∆
−∆

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