If B= [ cc 2 & 3 -4 & 3 ], then co-factor A_ 21 = - Vidyadip

MCQ

If $B=\left[\begin{array}{cc}2 & 3 \\ -4 & 3\end{array}\right]$, then co-factor $A_{21}=$

A
2
✓
$-3$
C
$-4$
D
3

✓

Answer

Correct option: B.

$-3$

(B) $A _{21}=(-1)^3 M _{21}=-(3)=-3$

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