What are the first three terms of the arithmetic series if a1 = -1, an = -115, and Sn = -1160?

What are the first three terms of the arithmetic series if a1 = -1, an = -115, and Sn = -1160?

Hey! We 've verified this expert answer for you, click below to unlock the details :)

I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!

isn't the formula for the sum something like \(S=\frac{n}{2}(a_1+a_n)\)?

i think that is right

so we can solve for \(n\)
\[\frac{n}{2}(-1-115)=-1160\] or
\[\frac{n}{2}\times (-116)=-1160\]

Looking for something else?

Not the answer you are looking for? Search for more explanations.

## More answers

Looking for something else?

Not the answer you are looking for? Search for more explanations.