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Arithmetic Sequences
easy
0:00.0
Find
d
d
d
if
a
1
=
0
a_1=0
a
1
=
0
and
a
2
=
−
1
a_2=-1
a
2
=
−
1
.
A
−
1
-1
−
1
B
1
1
1
C
0
0
0
D
−
2
-2
−
2
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