Question:medium

A, C are \( 3 \times 3 \) matrices. B, D are \( 3 \times 1 \) matrices. If \( AX=B \) has a unique solution and \( CX=D \) has an infinite number of solutions, then

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Always recall: A unique solution for an \( n \times n \) system implies the coefficient matrix has rank \( n \). Infinite solutions imply rank \(<n \). The rank of an augmented matrix cannot exceed the number of rows.
Updated On: Mar 26, 2026
  • rank of \( [A:D] = \text{rank of } [C:B] \)
  • rank of \( A = \text{rank of } C \)
  • rank of \( [A:B]<\text{rank of } [B:D] \)
  • rank of \( [A:D] \ge \text{rank of } [C:B] \)
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The Correct Option is D

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