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What is the sum of the arithmetic series below? Use the formula for the sum of an arithmetic series. 18 ∑ 2i-9 i=1
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1 vote
What is the sum of the arithmetic series below? Use the formula for the sum of an arithmetic series.

18
∑ 2i-9
i=1

User Haosdent
by
7.0k points

1 Answer

2 votes
The first term is 2(1) - 9 = -7
the common difference is 2
there are (18 - 1) + 1 = 18 terms in this series
the 18th term is -7 + 2(18-1) = 27

the sum is

sn = 18/2(-7 + 27) = 180
User Nawin
by
7.9k points
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