The co-factor A_ 12 for the matrix A= [ ll -2 & 3 -3 & 5 ] is - Vidyadip

MCQ

The co-factor $A_{12}$ for the matrix $A=\left[\begin{array}{ll}-2 & 3 \\ -3 & 5\end{array}\right]$ is

✓
3
B
-3
C
2
D
-5

✓

Answer

Correct option: A.

3

(A) $A _{12}=(-1)^{1+2} M _{12}=(-1)^3(-3)=3$

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