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Arithmetic Sequences
medium
0:00.0
Find
a
4
a_4
a
4
if
a
1
=
1
,
d
=
5
a_1=1, d=5
a
1
=
1
,
d
=
5
.
A
6
6
6
B
16
16
16
C
11
11
11
D
21
21
21
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