Alberto is stacking firewood. He puts 20 logs on the bottom row. Then he stacks each row so that there is 1 fewer log than the row below. Which of the following is formed by the number of logs in 10 rows?
A. an arithmetic series
B. an arithmetic sequence
C. a geometric series
D. a geometric sequence
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Home » Mathematics » Alberto is stacking firewood. He puts 20 logs on the bottom row. Then he stacks each row so that there is 1 fewer log than the row below. Which of the following is formed by the number of logs in 10 rows? A. an arithmetic series B.