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Adjoint of a Matrix

861 7 123 ...

Question

$\begin{matrix} 861 & (7) & 123 1107 & (. . . .) & 123 784 & (7) & 112 \end{matrix}$

A

9

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B

8

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C

5

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D

11

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Solution

The correct option is A 9
Divide the number in the first column with the number in the third column.
$\frac{861}{123} = 7$
$\frac{784}{112} = 8$
Thus, the missing number is: $\frac{1107}{123} = 9$

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