CBSE Class 12 Sample Paper for 2022 Boards (MCQ Based - for Term 1)

Question 17 - CBSE Class 12 Sample Paper for 2022 Boards (MCQ Based - for Term 1) - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at Sept. 4, 2021 by

Given that A = [πππ] is a square matrix of order 3 Γ 3 and |A| = β7, then the value of β_(i=1)
^{
3
}
a
_{
i2
}
A
_{
i2
}
" Β , where π΄
_{
ππ
}
denotes the cofactor of element πππ Β is:

Question 17 Given that A = [πππ] is a square matrix of order 3 Γ 3 and |A| = β7, then the value of β_(π=1)^3β"ππ2π΄π2 " , where π΄ππ denotes the cofactor of element πππ is: (a) 7 (b) β7 (c) 0 (d) 49
Now,
= π_ππ π¨_ππ+π_ππ π¨_ππ+π_ππ π¨_ππ
= Sum of product of elements of Row R2 with its corresponding cofactors
= Determinant of A
= |A|
= 7
So, the correct answer is (B)

CBSE Class 12 Sample Paper for 2022 Boards (MCQ Based - for Term 1)

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.