If B=[5 2α 1; 0 2 1] is the inverse of a... | Matrices | JEE Main

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JEE MAIN 2019

12-04-2019-S-1

Question

If $B=\left[\begin{array}{ccc}5 & 2 \alpha & 1 \\ 0 & 2 & 1\end{array}\right]$ is the inverse of a $3 \times 3$ matrix $A$, then the sum of all value of $\alpha$ for which $\operatorname{det}(A)+1=0$, is

Select the correct option:

A

–1

B

2

C

0

D

1

✓ Correct! Well done.

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