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Geometric Sequences
hard
0:00.0
Sum
1
+
r
+
r
2
1+r+r^2
1
+
r
+
r
2
.
A
(
r
3
−
1
)
/
(
r
−
1
)
(r^3-1)/(r-1)
(
r
3
−
1
)
/
(
r
−
1
)
B
r
2
+
r
+
1
r^2+r+1
r
2
+
r
+
1
C
Both a and b
D
None
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