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The rank of the matrix $\begin{bmatrix} 1 & 1 \\ 0 & 0 \end{bmatrix}$ is

1. $4$
2. $2$
3. $1$
4. $0$
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Rank of this matrix is 1 as the determint of 2nd order matrix is 0 and 1st order matrix is non zero so rank is 1
answered by Veteran (14k points)
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If u ever doubt in exam that rank can also be zero or not, then Only Null matrix has rank zero.
if we check no. of non zero rows , then the ranks becomes 1.   which way we should decide rank and what is the correct answer.