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UPSC 2016 CDS I Math Paper
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© examsnet.com
Question : 40
Total: 100
The value of
k
, for which the system of equations
3
x
−
k
y
−
20
=
0
and
6
x
−
10
y
+
40
=
0
has no solution, is
[2016 CDS-I]
10
5
3
Validate
Solution:
The given system of equations has no solution if
a
1
a
2
=
b
1
b
2
≠
c
1
c
2
⇒
3
6
=
−
k
−
10
≠
−
20
40
⇒
1
2
=
k
10
⇒
k
=
5
© examsnet.com
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