What is the sum of the arithmetic sequence 153, 139, 125, …, if there are 22 terms?
1 Answer
Explanation:
First, find the value of
Therefore,
Then find the difference between the values you have been given. Knowing that this is an arithmetic sequence, the difference
Therefore,
We also have been told that there are
Now the sum of all the terms in the arithmetic sequence can be found by substituting in the values for