The rank of the matrix $A=\begin{pmatrix} 1 & 2 & 1 & -1\\ 9& 5& 2& 2\\ 7& 1& 0 & 4 \end{pmatrix}$ is ______ .
Rank of Matrix is 2.
That's 2.
Read this;
https://en.wikipedia.org/wiki/Row_echelon_form
http://stattrek.com/matrix-algebra/matrix-rank.aspx
means, if we get row echelon form we stop.
https://www.youtube.com/watch?v=24Jin6qm05o
@ cse7 .Check this lecture.
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