Compute the next value: 8, 28, 116, 584, ? — detect the repeated “multiply and then add a constant” rule to continue the sequence correctly.

Difficulty: Easy

Correct Answer: 3508

Explanation:


Introduction / Context:
This series is built by multiplying by an increasing integer and then adding a fixed constant. Recognizing that two-step pattern (multiply, then add) provides a direct path to the next term.



Given Data / Assumptions:

  • Sequence: 8 → 28 → 116 → 584 → ?
  • We suspect: multiply by n, then add a fixed small number.


Concept / Approach:
Check consecutive ratios to see the approximate multiplier, then verify whether a small constant (e.g., +4) is added. Confirm across steps; if consistent, apply the next multiplier and the same addend.



Step-by-Step Solution:

8 * 3 + 4 = 28.28 * 4 + 4 = 116.116 * 5 + 4 = 584.Thus pattern: multiply by 3, 4, 5, then add 4. Next multiplier is 6.Next term = 584 * 6 + 4 = 3504 + 4 = 3508.


Verification / Alternative check:
No other simple constant addend fits all prior links. The increasing multipliers (3, 4, 5, 6) plus a constant +4 produce exact matches every time.



Why Other Options Are Wrong:

  • 1752, 3502, 3504 do not result from the required “×6 then +4” step.


Common Pitfalls:
Attempting to use only multiplication without checking for a small additive constant, which is a frequent twist in series puzzles.



Final Answer:
3508


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