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Question
Mathematics
The 5th term of the series (10/9), (1/3), √(20/3), (2/3) ... is
Q. The
5
t
h
term of the series
9
10
,
3
1
,
3
20
,
3
2
...
is
2034
202
WBJEE
WBJEE 2008
Sequences and Series
Report Error
A
3
1
0%
B
1
0%
C
5
2
0%
D
3
2
100%
Solution:
The given series is
9
10
,
3
1
3
20
,
3
2
,
...
Here,
a
=
9
10
and
r
=
3
1
3
20
×
10
9
=
9
×
3
×
100
20
×
9
×
9
=
5
3
∴
T
5
=
a
r
4
=
9
10
(
5
3
)
2
=
9
10
×
5
×
5
3
×
3
=
5
2