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Arithmetic Sequences
hard
0:00.0
Find
d
d
d
if
a
1
=
k
a_1=k
a
1
=
k
and
a
n
=
k
a_n=k
a
n
=
k
.
A
0
0
0
B
k
k
k
C
1
1
1
D
None
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