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

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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 semester exam.

The question is from Types of Matrices in section Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Best answer
The correct option is (b) Lower triangular matrix

Best explanation: In lower triangular matrix A = [aij ]nxn, if aij = 0 for i < j.

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