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Find the rank of the following matrices ...

Find the rank of the following matrices by row reduction method:
(i) `[{:(1,1,1,3),(2,-1,3,4),(5,-1,7,11):}]` (ii) `[{:(1,2,-1),(3,-1,2),(1,-2,3),(1,-1,1):}]`
(iii) `[{:(3,-8,5,2),(2,-5,1,4),(-1,2,3,-2):}]`

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