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Mathematics
Problem
The expression
4
+
7
+
10
+
13
+
…
+
(
3
n
+
1
)
4+7+10+13+\ldots +\bigl(3n+1\bigr)
4
+
7
+
10
+
13
+
…
+
(
3
n
+
1
)
can be written in compact sigma notation. Which of the following is the correct representation? a)
∑
k
=
0
n
(
3
k
+
1
)
\displaystyle\sum_{k=0}^{n}(3k+1)
k
=
0
∑
n
(
3
k
+
1
)
b)
∑
k
=
1
n
(
3
k
+
4
)
\displaystyle\sum_{k=1}^{n}(3k+4)
k
=
1
∑
n
(
3
k
+
4
)
c)
∑
k
=
1
n
(
3
k
+
1
)
\displaystyle\sum_{k=1}^{n}(3k+1)
k
=
1
∑
n
(
3
k
+
1
)
d)
∑
k
=
1
n
+
1
(
3
k
+
1
)
\displaystyle\sum_{k=1}^{n+1}(3k+1)
k
=
1
∑
n
+
1
(
3
k
+
1
)
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