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Arithmetic Sequences
easy
0:00.0
What is
a
n
a_n
a
n
if
a
1
=
−
1
a_1 = -1
a
1
=
−
1
and
d
=
−
1
d = -1
d
=
−
1
?
A
n
n
n
B
−
n
-n
−
n
C
−
1
−
n
-1 - n
−
1
−
n
D
−
1
+
n
-1 + n
−
1
+
n
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