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Arithmetic Sequences
medium
0:00.0
Sum
x
+
(
x
+
1
)
+
(
x
+
2
)
x + (x+1) + (x+2)
x
+
(
x
+
1
)
+
(
x
+
2
)
.
A
3
x
+
3
3x+3
3
x
+
3
B
3
x
3x
3
x
C
x
+
3
x+3
x
+
3
D
3
x
+
1
3x+1
3
x
+
1
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