3 and 4 .Determinants and Matrices
easy

सिद्ध कीजिए कि आव्यूह $A =\left[\begin{array}{rrr}1 & -1 & 5 \\ -1 & 2 & 1 \\ 5 & 1 & 3\end{array}\right]$ एक सममित आव्यूह है।

Option A
Option B
Option C
Option D

Solution

We have :

$A^{\prime}=\left[\begin{array}{ccc}1 & -1 & 5 \\ -1 & 2 & 1 \\ 5 & 1 & 3\end{array}\right]=A$

$\therefore $  $A^{\prime}=A$

Hence, $A$ is a symmetric matrix.

Standard 12
Mathematics

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