Question

# A square matrix for and (constant) for is called a

- unit matrix
- scalar matrix
- Null matrix
- Diagonal matrix

Hint:

### Matrix of size n in n n square matrix with1 on the main diagonal and zero elsewhere is Unit matrix. A diagonal matrix is a matrix having non-zero elements only in the diagonal running from the upper left to the lower right. A scalar matrix is the special case diagonal matrix with all the diagonals elements equal and all off-diagonals element not equal. Null matrix is the matrix with all the elements zero.

## The correct answer is: scalar matrix

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