Mathematics, 15.07.2019 09:00 shawnr6989

The sum of the first 6 terms of an arithmetic sequence is 96. the sum of the first 10 terms is one third of the sum of the first 20 terms. calculate the first term, the 18th term, the the sum of the first 5 terms and the sum of the 6th term to the 20th term.

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