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Geometric Sequences
hard
0:00.0
What is
r
r
r
for
a
,
−
a
r
,
a
r
2
a, -ar, ar^2
a
,
−
a
r
,
a
r
2
?
A
−
r
-r
−
r
B
r
r
r
C
−
1
/
r
-1/r
−
1/
r
D
None
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