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Daily puzzle · 2026-10-30 · Arithmetic Sequences

Mathbound Daily Puzzle — 2026-10-30 — Arithmetic Sequences Solution

Level 2

Arithmetic sequence: first term 33, common difference 77. Sum of first 1212 terms?
  1. A.498
  2. B.491
  3. C.510
  4. D.36
  5. E.80

Answer: A

Key idea: Sn=n2(2a+(n−1)d)S_n=\frac n2(2a+(n-1)d).

Set it up: Plug values.

Solution: 498498.

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Mathbound Daily Puzzle — 2026-10-30 — Arithmetic Sequences Solution