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Manipal Entrance Test 2017 Math Paper
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© examsnet.com
Question : 41
Total: 70
If the
n
th term of the geometric progression,
5
,
−
5
2
,
5
4
,
−
5
8
,
.
.
.
is
5
1024
,
then the value of
n
is
11
10
9
4
Validate
Solution:
According to the question,
5
(
−
1
2
)
n
−
1
=
5
1024
⇒
(
−
1
2
)
n
−
1
=
(
1
2
)
10
⇒
n
−
1
=
10
⇒
n
=
11
© examsnet.com
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