uence. n-1) ...22 erm by the QI: Module 5 (Finding the Sum of the Terms of a Given Arithmetic Sequence) Answer: Answer: 1. Find the sum of the arithmetic sequence 5, 10, 15, 20, 25, 30. 2. 2+5+8+11+14+17+20 3. Sum of the first 15 terms in the sequence 2, 4, 6, 8, 10, 12, 14, ... 4. Find the sum of the arithmetic sequence 3, 7, 11, 15, 19, 23, 27, 31, 35, 39, 43, 47. Answer: (Complete the solution below.) Solution: Sn= (a1 + an) 12 S12 = _+ S12 = _L S12 = Therefore: The sum of the arithmetic sequence 3, 7, 11, 15, 19, 23, 27, 31, 35, 39, 43, 47 is sl.​