defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Determinants Application of Determinants
If the system of equations
(λ – 1)x + (λ – 4)y + λz = 5
λx + (λ – 1)y + (λ – 4)z = 7
(λ + 1)x + (λ + 2)y – (λ + 2)z = 9
has infinitely many solutions, then λ2 + λ is equal to
1
10
2
12
3
6
4
20