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19. (c) Perform these elementary row operations to the given matrix to reduce it into row-reduced matrix form : (i) R3' = R3 – R2 + R4 ,
(ii) R2 is interchanged by R4,
(iii) R4' = R4 - R3 ,
Then R4 of the given matrix will vanish. So, rank is 3.
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