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Arithmetic Sequences
hard
0:00.0
If
a
10
=
L
a_{10}=L
a
10
=
L
, what is
a
1
+
a
19
a_1 + a_{19}
a
1
+
a
19
?
A
2
L
2L
2
L
B
L
L
L
C
L
/
2
L/2
L
/2
D
0
0
0
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