GP Sum Difference (Jee Mains) | ExamDuo
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Arithmetic and Geometric Progression
Medium
GP Sum Difference
If each term of a geometric progression
a
1
,
a
2
,
a
3
,
.
.
.
with
a
1
=
1
8
and
a
2
≠
a
1
, is the arithmetic mean of the next two terms and
S
n
=
a
1
+
a
2
+
.
.
.
+
a
n
, then
S
20
−
S
18
is equal to
Ask about this question
SELECT ONE OPTION
A
2
15
B
−
2
18
C
2
18
D
−
2
15
Check