Question:
If a matrix $A$ is both symmetric and skew symmetric, then
If a matrix $A$ is both symmetric and skew symmetric, then
Updated On: May 22, 2024
- A is diagonal matrix
- A is a zero matrix
- A is scalar matrix
- A is square matrix
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The Correct Option is B
Solution and Explanation
Let $A$ be a matrix which is both symmetric and skew symmetric.
$\therefore A' = A$ and $A' = - A$
This is possible only when $A$ is zero matrix .
$\therefore A' = A$ and $A' = - A$
This is possible only when $A$ is zero matrix .
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Concepts Used:
Matrices
Matrix:
A matrix is a rectangular array of numbers, variables, symbols, or expressions that are defined for the operations like subtraction, addition, and multiplications. The size of a matrix is determined by the number of rows and columns in the matrix.
The basic operations that can be performed on matrices are:
- Addition of Matrices - The addition of matrices addition can only be possible if the number of rows and columns of both the matrices are the same.
- Subtraction of Matrices - Matrices subtraction is also possible only if the number of rows and columns of both the matrices are the same.
- Scalar Multiplication - The product of a matrix A with any number 'c' is obtained by multiplying every entry of the matrix A by c, is called scalar multiplication.
- Multiplication of Matrices - Matrices multiplication is defined only if the number of columns in the first matrix and rows in the second matrix are equal.
- Transpose of Matrices - Interchanging of rows and columns is known as the transpose of matrices.