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Arithmetic Sequences
hard
0:00.0
Sum
x
,
x
+
d
,
x
+
2
d
x, x+d, x+2d
x
,
x
+
d
,
x
+
2
d
.
A
3
x
+
3
d
3x+3d
3
x
+
3
d
B
3
x
+
2
d
3x+2d
3
x
+
2
d
C
3
x
+
d
3x+d
3
x
+
d
D
x
+
3
d
x+3d
x
+
3
d
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