The number of real values of λ for which the system of linear equations
2x + 4y - λz = 0
4x + λy + 2z = 0
λx + 2y + 2z = 0
has infinitely many solutions, is :
1
0
2
1
3
2
4
3
The number of real values of λ for which the system of linear equations
2x + 4y - λz = 0
4x + λy + 2z = 0
λx + 2y + 2z = 0
has infinitely many solutions, is :