engineering recuitment NIELIT Scientific Assistant Mock Test 2025 Engineering Mathematics Linear Algebra System of Linear Equations
If the nullity of the matrix \(\left[ {\begin{array}{*{20}{c}} k&1&2\\ 1&{ - 1}&{ - 2}\\ 1&1&4 \end{array}} \right]\) is 1, then the value of k is
1
-1
2
0
3
1
4
2