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Arithmetic Sequences
medium
0:00.0
If
a
3
=
10
a_3 = 10
a
3
=
10
and
S
3
=
21
S_3 = 21
S
3
=
21
, find
a
1
a_1
a
1
.
A
4
4
4
B
5
5
5
C
6
6
6
D
3
3
3
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