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Arithmetic Sequences
medium
0:00.0
What is the common difference
d
d
d
if
a
1
=
12
a_1 = 12
a
1
=
12
and
a
10
=
30
a_{10} = 30
a
10
=
30
?
A
2
B
3
C
1.5
D
2.5
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