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In the matrix equation Px = q, which of the following is a necessary condition for the existence of at least one solution for the unknown vector x

In the matrix equation Px = q, which of the following is a necessary condition for the existence of at least one solution for the unknown vector x Correct Answer Augmented matrix must have the same rank as matrix P

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In the matrix equation Px = q, which of the following is a necessary condition for existence of at least one solution for unknown vector x?
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