Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
katiebugg
Group Title
The sum of an arithmetic series is 1356 and the first term is 1. If the common difference is 5, how many terms are in the sequence?
 2 years ago
 2 years ago
katiebugg Group Title
The sum of an arithmetic series is 1356 and the first term is 1. If the common difference is 5, how many terms are in the sequence?
 2 years ago
 2 years ago

This Question is Closed

ash2326 Group TitleBest ResponseYou've already chosen the best response.0
@katiebugg Sum of n terms is given 1356 First term \(a_1=1\) and common difference=5 we know that sum to n terms is given as \[S_n=\frac{n}{2}(a_1+a_n)\] \(a_n\) is the last term Do you get till this?
 2 years ago

ash2326 Group TitleBest ResponseYou've already chosen the best response.0
we know \(a_n\) is given as \[a_n=a_1+(n1)d\] d=common difference n=no. of terms so sum will become \[S_n=\frac n2 (a_1+a_1+(n1)d)\] now pluigin the numbers here and post what do you get, will you?
 2 years ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.