SOLUTION: How do I put -13+(-26)+(-39)+(-52)+(-65)+(-78) into sigma notątion?

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Question 1026504: How do I put -13+(-26)+(-39)+(-52)+(-65)+(-78) into sigma notątion?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Arithmetic progression, -13%2B%28-13%29%28n-1%29. Index of each term is n. Simplify the general term if wanted, -13-13n%2B13=-13n. Your summation uses 6 terms, from index 1 to 6.

sum%28%28-13n%29%2C1%2C6%29