For a 2 2 matrix A, if A(adj A)= ( ll 10 & 0 0 & 10 ) then determ… - Vidyadip

MCQ

For a $2 \times 2$ matrix $A$, if $A(\operatorname{adj} A)=\left(\begin{array}{ll}10 & 0 \\ 0 & 10\end{array}\right)$ then determinant $A$ equals

A
20
✓
10
C
30
D
40

✓

Answer

Correct option: B.

10

10

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