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Recurrence Relations
easy
0:00.0
Calculate
a
2
a_2
a
2
if
a
n
=
−
a
n
−
1
a_n = -a_{n-1}
a
n
=
−
a
n
−
1
and
a
1
=
−
1
a_1=-1
a
1
=
−
1
.
A
1
1
1
B
−
1
-1
−
1
C
0
0
0
D
2
2
2
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