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Byju's Answer
Standard XII
Mathematics
Sum of n Terms
If the rth ...
Question
If the
r
t
h
term is middle term in the expansion of
(
x
2
−
1
2
x
)
20
then find the
(
r
+
3
)
t
h
term.
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Solution
∴
T
r
=
T
11
Thus,
(
r
+
3
)
th term is the 14th term of the given expansion
T
14
=
20
C
13
(
x
2
)
20
−
13
(
−
1
2
x
)
13
=
20
C
13
.
x
.
2
−
13
=
20
C
13
x
.
2
−
13
[
20
C
13
=
20
C
7
]
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