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UPSC NDA 2 2017 Mathematics Solved Paper
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© examsnet.com
Question : 18
Total: 120
In the expansion of
(
1
+
x
)
50
, the sum of the coefficients of odd powers of x is
[NDA II 2017]
2
26
2
49
2
50
2
51
Validate
Solution:
ln
(
1
+
x
)
50
C
1
+
C
3
+
C
5
+
.
.
=
1
2
×
2
50
=
2
49
[
∵
C
0
+
C
1
+
C
2
+
.
.
.
.
.
C
n
=
2
n
© examsnet.com
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