#### Sample Question

Which formula should you use to find the sum of the sequence given the first and last terms?

Thousands of topics and study guides for students and teachers!

To find out more about Quipper School, click here!
Which formula should you use to find the sum of the sequence given the first and last terms?

- [% a_n=a_1+\left(n-1\right)d %]
- [% S_n=\frac{n}{2}\left(a_1+a_n\right) %]
- [% S_n=\frac{n}{2}\left[2a_1+\left(n-1\right)d\right] %]
- [% a_n=a+\left(n-1\right)d %]

This is just one of our 117,928 study questions in Quipper School.