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UPSC NDA I 2012 Mathematics Paper
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© examsnet.com
Question : 9
Total: 120
What is the arithmetic mean of first 16 natural numbers with weights being the number itself?
17
∕
2
33
∕
2
11
187
∕
2
Validate
Solution:
S
16
=
16
2
[
2
(
1
)
+
15
(
1
)
]
=
8
(
17
)
=
136
A.M.
=
136
16
=
17
2
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