Correction: Assume typo; try with Sₙ = 98 → n = 7. But original says 110.
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- Wait: Try n = 8 gives 124, n = 7 gives 98 — no match.
- But if equation is correct, then solve exactly:
- Discriminant = \( 49 + 2640 = 2689 \), which is not a perfect square → no integer n.
- Alternatively, perhaps question is valid only for non-integer n, but n must be integer.
- Therefore, no integer solution. But likely intended:
- Try n = 8: 4×(10 + 21) = 124
