Rank of Matrix

Ask

The rank of the matrix $$ \begin{bmatrix} 1 & 1 & 1\\ 1 &-1 &0 \\ 1 & 1 & 1 \end{bmatrix}$$ is:
 (a) 0 
 (b) 1 
 (c) 2
 (d) 3

Answer is (c)

Concept

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