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Mathematics, 20.09.2020 02:01 justalittle

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 can be used to determine the total number of logs in 10 rows?

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Alberto is stacking firewood. He puts 20 logs on the bottom row. Then he stacks each row so that the...
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