1.

The rank of matrix \(\left[ {\begin{array}{*{20}{c}} 1&2&2&3\\ 3&4&2&5\\ 5&6&2&7\\ 7&8&2&9 \end{array}} \right]\) is ___.

A. 3
B. 1
C. 4
D. 2
Answer» E.


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