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Arithmetic Sequences
medium
0:00.0
Find
a
3
a_3
a
3
if
a
1
=
1
,
d
=
−
1
a_1=1, d=-1
a
1
=
1
,
d
=
−
1
.
A
−
1
-1
−
1
B
0
0
0
C
−
2
-2
−
2
D
1
1
1
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