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Byju's Answer
Standard XII
Mathematics
Greatest Binomial Coefficients
Coefficient o...
Question
Coefficient of
x
2001
in the expansion of
(
1
+
x
+
x
2
+
x
3
+
x
4
)
1001
(
1
−
x
)
1002
is
A
0
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B
4
1001
C
501
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C
−
2009
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D
2
×
1001
C
501
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Solution
The correct option is
A
0
In binomial expansion of negative index,
(
1
−
x
)
−
1
=
(
1
+
x
+
x
2
+
.
.
.
.
.
.
x
n
)
1001
is
⇒
(
1
+
x
+
x
2
+
x
3
+
.
.
.
.
x
n
)
1001
(
1
−
x
)
1002
=
(
1
−
x
)
−
1001
(
1
−
x
)
1002
=
(
1
−
x
)
⇒
coefficient of
x
2001
is
0.....
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0
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