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Find the common difference of the arithmetic sequence -18, -21, -24

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Answer: 3

step-by-step example:■ The 24th value of the sequence (a24) is 501

■ Sample of the first ten numbers in the sequence: 18, 39, 60, 81, 102, 123, 144, 165, 186, 207

■ Sum of all numbers until the 24th: 6228

■ The mean value of the series: 259.5

■ Standard deviation: 145.3659

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