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Arithmetic Sequences
medium
0:00.0
If
a
10
=
0
a_{10}=0
a
10
=
0
and
d
=
1
d=1
d
=
1
, find
a
1
a_1
a
1
.
A
−
9
-9
−
9
B
9
9
9
C
−
10
-10
−
10
D
10
10
10
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