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Arithmetic Sequences
easy
0:00.0
If
a
n
=
3
n
−
1
a_n = 3n-1
a
n
=
3
n
−
1
, find the sum of the first
3
3
3
terms.
A
18
18
18
B
12
12
12
C
21
21
21
D
15
15
15
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