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Questions › DSE › DSE 2008 › Q53
2 marksMathematics › Matrices, determinants and linear systems › Consistency, rank and solution spacesModerateabout 3 min

DSE 2008 Question 53: Matrices, determinants and linear systems

Consider the equation Ax=0Ax=0Ax=0 where A is an n×nn\times nn×n matrix such that aii≠0a_{ii}\ne 0aii​=0 for every i∈{1,…,n}i\in\{1,\ldots,n\}i∈{1,…,n} and aij=0a_{ij}=0aij​=0 whenever i>ji>ji>j. This equation has

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Consider the equation Ax=0 where A is an n× n matrix such that aᵢᵢ≠ 0 for every i∈{1,…,n} and aᵢⱼ=0 whenever i>j. This equation has (A) n distinct solutions (B) an n-1 dimensional vector space of solutions (C) exactly one solution (D) an n dimensional vector space of solutions

Also written as: Consider the equation Ax=0 where A is an n* n matrix such that a_(ii)!= 0 for every i in {1,...,n} and a_(ij)=0 whenever i>j. This equation has

Matrices, determinants and linear systems has come up 102 times in 7 exams since 2006.

What this question tests

This question is on Consistency, rank and solution spaces, part of Matrices, determinants and linear systems in Mathematics.

Whether a system has no solution, one or many, and the shape of its solution set.

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Question from the DSE 2008 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.