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DETERMINANTS — Maths STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceMathsDETERMINANTS1 Mark
MCQ
For which of the following elements in the determinant $\triangle\begin{bmatrix}2&8\\4&7\end{bmatrix},$ the minor of the element is 2:
  • A
    2
  • ✓
    7
  • C
    4
  • D
    8
✓

Answer

Correct option: B.
7
Consider the element 7 in the determinant $\triangle\begin{bmatrix}2&8\\4&7\end{bmatrix}$

The minor of the element 7 can be obtained by deleting $\text{R}_2$ and $\text{C}_2$

$\therefore\text{M}_{22}=2$

Hence, the minor of the element 7 is 2.

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