The rank of the matrix left begin array 20 c -...

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The rank of the matrix \[\left[ {\begin{array}{*{20}{c}} { - 4}&1&{ - 1} \\ { - 1}&{ - 1}&{ - 1} \\ 7&{ - 3}&1 \end{array}} \right]\] is

A. 1

B. 2

C. 3

D. 4

Answer: Option B

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