JEE Main2019Math
Q.
If B = \left[ {\begin{array}{*{20}{c}} 5{2\alpha }1 \\ 021 \\ \alpha 3{ - 1}\end{array}} \right]is the inverse of a 3 × 3 matrix A, then the sum of all value of for which det (A) + 1 = 0, is :
- A
–1
- B
2
- C
0
- D
1
Solution
