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The rank of the matrix $A=\begin{pmatrix} 1 & 2 & 1 & -1\\ 9& 5& 2& 2\\ 7& 1& 0 & 4 \end{pmatrix}$  is ______ .

  1. $0$
  2. $1$
  3. $2$
  4. $3$
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Rank of Matrix is 2.

That's 2.

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