The system of linear equation kx + y + z = 1, x + ky + z = 1 and x + y + kz = 1 has a unique solution under which one of
The logic is straightforward: using formula we get k ≠ 1 and k ≠ -2. Calculation gives this directly, check steps: apply rule, substitute values, simplify to get k ≠ 1 and k ≠ -2.
Ref: NCERT Mathematics Class XII — Matrices and Determinants
