SOLUTION: How to define the given series for 7 terms -13+-16+-19+....

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Question 448470: How to define the given series for 7 terms -13+-16+-19+....
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 
Hi,
Arithmetic series/7 terms: {-13,-16,-19,...} highlight%28d=-3%29
S%5Bn%5D=%28n%2F2%29%282%2Aa%5B1%5D%2B+%28n-1%29d%29
S%5B7%5D=%287%2F2%29%282%2A-13%2B+6%2A-3%29+=+highlight%28-154%29