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UPSC NDA I 2012 Mathematics Paper
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© examsnet.com
Question : 60
Total: 120
If
1
∕
4
,
1
∕
x
,
1
∕
10
are in HP, then what is the value of
x
?
5
6
7
8
Validate
Solution:
4
,
x
,
10
are
m
AP
.
2
x
=
4
+
10
x
=
14
2
=
7
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