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TS ICET 24 May 2018 Shift 1 Paper
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© examsnet.com
Question : 130
Total: 200
The coefficient of
x
7
in the binomial expansion of
(
2
x
3
+
1
4
x
2
)
9
is
63
4
0
32
17
4
Validate
Solution:
Let
T
r
+
1
be the term that contain
x
7
r
=
n
p
−
k
p
+
q
=
9
×
3
−
7
3
+
2
=
20
5
=
4
∴ coefficient of
T
5
=
T
4
+
1
=
9
C
4
(
2
)
9
−
4
(
1
4
)
4
=
126
×
2
5
2
8
=
126
8
=
63
4
© examsnet.com
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