Consider the matrix

MATHEMATICS · Single correct · CBSE · Mathematics · Determinants · Determinants

Problem

Consider the matrix

A=\begin{pmatrix}1 & k & 2\\ 0 & 1 & -1\\ 3 & 4 & k\end{pmatrix}

, where

k>0

. If

(\text{adj}\,A)_{12}=4

, then

k

equals (a)

-2

(b)

4

(c)

2

(d)

2\sqrt{3}