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Arithmetic Sequences
hard
0:00.0
If
a
1
=
2
,
d
=
2
a_1=2, d=2
a
1
=
2
,
d
=
2
, find
S
n
S_n
S
n
.
A
n
(
n
+
1
)
n(n+1)
n
(
n
+
1
)
B
n
2
n^2
n
2
C
2
n
2n
2
n
D
None
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