Use sigma notation to write the sum. $\frac { 1 } { 3 ( 1 ) } + \frac { 1 } { 3 ( 2 ) } + \frac { 1 } { 3 ( 3 ) } + \ldots + \frac { 1 } { 3 ( 9 ) }$
A) $\sum _ { i = 1 } ^ { 9 } - \frac { 1 } { 3 i }$
B) $\sum _ { i = 0 } ^ { 10 } \frac { 1 } { 3 i }$
C) $\sum _ { i = 1 } ^ { 9 } 3 i$
D) $\sum _ { i = 1 } ^ { 9 } \frac { 1 } { 3 i }$
E) $\sum _ { i = 1 } ^ { - 9 } \frac { 1 } { 3 i }$

Question

Use sigma notation to write the sum.   $\frac { 1 } { 3 ( 1 ) } + \frac { 1 } { 3 ( 2 ) } + \frac { 1 } { 3 ( 3 ) } + \ldots + \frac { 1 } { 3 ( 9 ) }$  
A) $\sum _ { i = 1 } ^ { 9 } - \frac { 1 } { 3 i }$
B) $\sum _ { i = 0 } ^ { 10 } \frac { 1 } { 3 i }$
C) $\sum _ { i = 1 } ^ { 9 } 3 i$
D) $\sum _ { i = 1 } ^ { 9 } \frac { 1 } { 3 i }$
E) $\sum _ { i = 1 } ^ { - 9 } \frac { 1 } { 3 i }$

Quizplus · Accepted Answer

The given sum can be represented using sigma notation as the sum from $i = 1$ to $i = 9$ of $\frac{1}{3i}$, which matches option D.

Use Sigma Notation to Write the Sum 13(1)+13(2)+13(3)+…+13(9)\frac { 1 } { 3 ( 1 ) } + \frac { 1 } { 3 ( 2 ) } + \frac { 1 } { 3 ( 3 ) } + \ldots + \frac { 1 } { 3 ( 9 ) }3(1)1​+3(2)1​+3(3)1​+…+3(9)1​

Use Sigma Notation to Write the Sum $\frac { 1 } { 3 ( 1 ) } + \frac { 1 } { 3 ( 2 ) } + \frac { 1 } { 3 ( 3 ) } + \ldots + \frac { 1 } { 3 ( 9 ) }$