The system of equations
$$x + y + z = 6$$
$$x + 2 y + 5 z = 9$$
$$x + 5 y + \lambda z = \mu$$
has no solution if\\
(1) $\lambda = 15 , \mu \neq 17$\\
(2) $\lambda \neq 17 , \mu \neq 18$\\
(3) $\lambda = 17 , \mu \neq 18$\\
(4) $\lambda = 17 , \mu = 18$