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Can you please help me answer number22? 22. (L78) If 3, -, and - are the first three terms of an arithmetic sequence, what is

Can you please help me answer number22?

22. (L78) If 3, -, and - are the first three terms of an arithmetic sequence, what is the sum of the first 21 terms of this sequence? A. 564.1 B. 762.4 C. 1375.5 D. 1849.2 E. None of the above

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