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UPSC NDA 2 2012 Mathematics Paper
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© examsnet.com
Question : 24
Total: 120
If the sum of matrices
[
x
x
y
]
,
[
y
y
z
]
and
[
z
0
0
]
is the matrix
[
10
5
5
]
then what is the value of
y
?
−
5
0
5
10
Validate
Solution:
x
+
y
+
z
=
10
x
+
y
+
0
=
5
y
+
z
+
0
=
5
5
+
z
=
10
z
=
5
y
+
z
=
5
y
=
5
−
5
=
0
© examsnet.com
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