#### Sample Question

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

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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 %]

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