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NDA Math Sequences and Series
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© examsnet.com
Question : 40
Total: 79
If the second term of a GP is 2 and the sum of its infinite term is 8,then the GP is
[NDA II 2018]
8
,
2
,
1
2
,
1
8
,
.
.
.
10
,
2
,
2
5
,
2
25
,
.
.
.
.
4
,
2
,
1
,
1
2
,
1
2
2
,
.
.
.
6
,
3
,
3
2
,
3
4
,
.
.
.
Validate
Solution:
a
r
=
2
,
a
1
−
r
=
8
⇒
a
r
r
−
r
2
=
8
⇒
2
=
8
r
−
8
r
2
⇒
4
r
2
−
4
r
+
1
=
0
⇒
r
=
1
2
∴ G.P . is
4
,
2
,
1
,
1
2
,
.
.
.
.
© examsnet.com
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