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NDA Math Determinants
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© examsnet.com
Question : 41
Total: 68
The equations
x
+
2
y
+
3
z
=
1
2
x
+
y
+
3
z
=
2
5
x
+
5
y
+
9
z
=
4
[NDA I 2017]
Have the unique solution
Have infinitely many solutions
Are inconsistent
None of the above
Validate
Solution:
|
1
2
3
2
1
3
5
5
9
|
=
1
(
9
−
15
)
−
2
(
18
−
15
)
+
3
(
10
−
5
)
=
−
6
−
6
+
15
=
3
≠
0
⟹ system has unique solution.
© examsnet.com
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