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1. What is the sum of 3,5,7,9,. 57?
2. What is the sum of 1-3 - 7 - 11. -51?
3. Find the sum of the series 14 + 11 + 8 +. -43?
4. In the arithmetic sequence a, = 7 and a 12 = 29. Find the sum of the first
12 terms.
5. Find S10 in the arithmetic sequence whose first term is -14 and the fifth
term is 30.