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Q44Section C (Section C)44 of 60

Rank of a four-by-four matrix

The rank of the matrix (1111123225642685)\begin{pmatrix}1&1&1&1\\1&2&3&2\\2&5&6&4\\2&6&8&5\end{pmatrix} is __________

Numerical answer: type the number (no options).

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