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TS EAMCET · Maths · Matrices

\(A=\left[a_{i j}\right]\) is a \(3 \times 3\) matrix with positive integers as its elements. Elements of A are such that the sum of all the elements of each row is equal to 6 and \(a_{22}=2\).
If \(a_{i i}=\left\{\begin{array}{ll}a_{i j}+a_{j i}, & j=i+1 \text { when } i \lt 3 \\ a_{i j}+a_{j i}, & j=4-i \text { when } i=3\end{array}\right.\) for \(i=1,2,3\), then \(|A|=\)

  1. A 6
  2. B 18
  3. C 3
  4. D 12
Verified Solution

Answer & Solution

Correct Answer

(D) 12

Step-by-step Solution

Detailed explanation

\(\operatorname{Consider} \mathbf{A}=\left[\begin{array}{lll}a_{11} & a_{12} & a_{13} \\ a_{21} & a_{22} & a_{23} \\ a_{31} & a_{32} & a_{33}\end{array}\right]\) Each row sum is 6…