Answer: 6n + 2.
- A 6n + 2
- B 6n - 2
- C 6n + 5
- D 3n + 5
Correct answer: A. 6n + 2
Explanation: Tn = Sn - S(n-1) = 3n²+5n - 3(n-1)²-5(n-1) = 6n - 3 + 5 = 6n + 2.
Bar heights for AP 2, 5, 8, 11 with the common difference d=3 marked between consecutive terms.
Concept context
Arithmetic progressions, geometric progressions, and sums