SOLUTION: find the sum of the arithmetic series whose first term is 52, whose last term is 12 and which contains 20 terms.

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Question 843090: find the sum of the arithmetic series whose first term is 52, whose last term is 12 and which contains 20 terms.
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,

find the sum of the arithmetic series whose first term is 52, whose last term is 12 and which contains 20 terms.

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

S%5B20%5D=%2820%2852%2B12%29%29%2F2+=+640