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Please help with the following questions: Problem 9. An arithmetic sequence has first term a1 = 1 and fourth term a4 = 16. How many

Please help with the following questions:

Problem 9. An arithmetic sequence has first term a1 = 1 and fourth term a4 = 16. How many terms of this sequence must be added to get 2356?Problem 10. Find the sum of the finite geometric series 3 + 31/2 + 1 + 3-1/2 + ... + 3-21

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