SOLUTION: When I am looking for the indicated sum of the following equation 9 &#931;6 i=4 I know that there are 9 terms but what throws me off is that i is usually equal to 1 not 4.

Click here to see ALL problems on Sequences-and-series

Question 977823: When I am looking for the indicated sum of the following equation
9
Σ6
i=4
I know that there are 9 terms but what throws me off is that i is usually equal to 1 not 4. How do I proceed?
Answer by jim_thompson5910(35256) (Show Source):
You can put this solution on YOUR website!
List out the numbers from 4 to 9:
4,5,6,7,8,9

There are 6 numbers in that list. Notice how 9-4+1 = 6

So you will be adding up the number 6 a total of 6 times. In short, you multiply 6*6 = 36 which is the final answer.

General Formula:

Notes:

1) k is a fixed number and never changes value (in your case, k = 6)

2) This formula allows you to start at i = 1 if you wish (just make m = 1). But you can easily start from any other number. Just make sure that

SOLUTION: When I am looking for the indicated sum of the following equation 9 &#931;6 i=4 I know that there are 9 terms but what throws me off is that i is usually equal to 1 not 4.

SOLUTION: When I am looking for the indicated sum of the following equation 9 Σ6 i=4 I know that there are 9 terms but what throws me off is that i is usually equal to 1 not 4.