Question:medium

Consider a homogeneous system of three linear equations in three unknowns represented by $AX=O$. If $X = \begin{pmatrix}l \\ m \\ 0 \end{pmatrix}, l \neq 0, m \neq 0, l, m \in \mathbb{R}$ represents an infinite number of solutions of this system, then rank of A is

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If the solution space of $AX=0$ contains an entire plane or line, directly think in terms of nullity. Then use the relation: rank + nullity = number of columns.
Updated On: Mar 30, 2026
  • 3
  • 2
  • 1
  • does not exist
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The Correct Option is C

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