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Arithmetic Sequences
easy
0:00.0
Find
d
d
d
if
a
1
=
5
a_1=5
a
1
=
5
and
a
3
=
15
a_3=15
a
3
=
15
.
A
2
2
2
B
5
5
5
C
10
10
10
D
15
15
15
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