Basic Maths - Grand Test 1 -Q8

+2 votes

If  A =   \begin{bmatrix} 1 &1 &1 \\ 0 & 1 & 2\\ 2 & 0 & 1 \end{bmatrix}   then A(adjA) is equal to ______

(A).\begin{bmatrix} 1 &0 &2 \\ 1 & 1 & 0\\ 1 & 2 & 1 \end{bmatrix}

(B).\begin{bmatrix} 2 &0 &0 \\ 0 & 2 & 0\\ 0 & 0 & 2 \end{bmatrix}

(C).\begin{bmatrix} 1 &0 &0 \\ 0 & 1 & 0\\ 0 & 0 & 1 \end{bmatrix}

(D).\begin{bmatrix} 3 &0 &0 \\ 0 & 3 & 0\\ 0 & 0 & 3 \end{bmatrix}

 

 

asked Jun 21 in Basic Maths by gbeditor (21,290 points)
reshown Jun 23 by gbeditor

1 Answer

0 votes
A(AdjA)=|A|. In

Here determinant of matrix is 3

So 3.In

So d is correct one
answered Jun 23 by tsnikhilsharmagate2018 (24,690 points)
edited Jun 23 by tsnikhilsharmagate2018
|A|=3 and answer is D
Yes determinant of matrix 3
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