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Arithmetic Sequences
hard
0:00.0
An AP has
a
3
=
7
a_3 = 7
a
3
=
7
and
a
4
=
9
a_4 = 9
a
4
=
9
. Find
a
1
a_1
a
1
.
A
1
1
1
B
2
2
2
C
3
3
3
D
4
4
4
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