SOLUTION: What is the sum of the finite arithmetic series?

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Question 614130: What is the sum of the finite arithmetic series?
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi, 

What is the sum of the finite arithmetic series?

Knowing the 1st and nth Term:

S%5Bn%5D=%28n%28a%5B1%5D%2Ba%5Bn%5D%29%29%2F2

In general:

S%5Bn%5D=%28n%2F2%29%282%2Aa%5B1%5D%2B+%28n-1%29d%29