aₙ = Sₙ - Sₙ₋₁ = 3n² + 5n - 3(n-1)² - 5(n-1) = 6n + 2. So d = a₂ - a₁ = 14 - 8 = 6
Back to JEE Main 2023 Algebra
JEE Main 2023 — Mathematics Algebra
medium
mcq
2023
Official previous-year question
Verified 30 May 2026.
Question
If the sum of first n terms of an AP is 3n² + 5n, then the common difference is:
Options
- A3
- B5
- C6
- D8
Solution
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