The rank of the matrix left begin array 20 c 1&1&1...

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The rank of the matrix \[\left[ {\begin{array}{*{20}{c}} 1&1&1 \\ 1&{ - 1}&0 \\ 1&1&1 \end{array}} \right]\] is

A. 0

B. 1

C. 2

D. 3

Answer: Option C

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