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Arithmetic Sequences
hard
0:00.0
In an AP,
a
1
=
5
a_1=5
a
1
=
5
and
a
10
=
23
a_{10}=23
a
10
=
23
. Find
d
d
d
.
A
1.5
1.5
1.5
B
2
2
2
C
2.5
2.5
2.5
D
3
3
3
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