JEE Math Practice Question
If $$B = \left[ {\begin{matrix} 5 & {2\alpha } & 1 \\ 0 & 2 & 1 \\ \alpha & 3 & { - 1} \\ \end{matrix} } \right]$$ is the inverse of a 3 × 3 matrix A, then the sum of all values of $$\alpha $$ for which det(A) + 1 = 0, is :
- A.2
- B.- 1
- C.0
- D.1
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