Question

A square matrix A = [aij ]nxn, if aij = 0 for i > j then that matrix is known as _______

(a) Upper triangular matrix

(b) Lower triangular matrix

(c) Unit matrix

(d) Null matrix

The question was asked in class test.

This intriguing question comes from Types of Matrices in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

Answer 1

Correct answer is (a) Upper triangular matrix

For explanation: In upper triangular matrix A = [ aij ]nxn, if aij = 0 for i > j.