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An arithmetic series contains 20 numbers. The first number is 102. The last number is 159. Which expression represents the sum of the series?

User ZPPP
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2 Answers

6 votes
given that 159-102=57

and 57/20=2.85

n=2.85

you would make the sum be 102+1n+2n.......20n= sum
User Crewshin
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4 votes

Answer:

It's B

Explanation:

20(102+159/2)

User Evgnomon
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