SOLUTION: What is the sum of this arithmetic series? https://postimg.org/image/p3law3x9z/ A.) 25 B.) 126 C.) 133 D.) 119 Please & TY!

Algebra ->  Sequences-and-series -> SOLUTION: What is the sum of this arithmetic series? https://postimg.org/image/p3law3x9z/ A.) 25 B.) 126 C.) 133 D.) 119 Please & TY!      Log On


   

Question 1041160: What is the sum of this arithmetic series?
https://postimg.org/image/p3law3x9z/
A.) 25
B.) 126
C.) 133
D.) 119
Please & TY!
Found 2 solutions by jim_thompson5910, ikleyn:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!



We will use the following rules for summations


Rule 1:


Rule 2:


Rule 3:


Rule 4:


where c is a constant


-----------------------------------------





Use rule 1 (shown above)


Use rule 2 (shown above)


Use rule 3 (shown above)


Use rule 4 (shown above)

















-----------------------------------------


So


The final answer is 133



Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.
On arithmetic progressions see the lesson  Arithmetic progressions  in this site.