For the matrix

MATHEMATICS · Subjective · CBSE · Mathematics · Determinants · Determinants

Problem

For the matrix

A=\begin{pmatrix} a & 1 & 1 \\ 1 & b & 1 \\ 1 & 1 & 2 \end{pmatrix}

, derive the relation between

a

and

b

that makes

A

singular.