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Arithmetic Sequences
hard
0:00.0
Find
a
1
a_1
a
1
if
a
100
=
100
a_{100}=100
a
100
=
100
and
d
=
1
d=1
d
=
1
.
A
1
1
1
B
0
0
0
C
−
99
-99
−
99
D
−
100
-100
−
100
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