Infinite solution $\lambda=1 \& \mu=13$
For unique $\operatorname{sol}^{\mathrm{n}} \lambda \neq 1$
For no $\operatorname{sol}^{\mathrm{n}} \lambda=1 \& \mu \neq 13$
If $\lambda \neq 1$ and $\mu \neq 13$
Considering the case when $\lambda=-\frac{1}{2}$ and $\mu \neq 13$ this will generate no solution case
$2 x+y-z=5$
$2 x-5 y+\lambda z=\mu$
$x+2 y-5 z=7$
ને અસંખ્ય ઉકેલો હોય,તો
$(\lambda+\mu)^2+(\lambda-\mu)^2=........$