Number series (alternate ×3 and ÷2 pattern): 8, 24, 12, 36, 18, 54, (…) Find the next term that correctly continues the alternating multiplication/division sequence.

Difficulty: Easy

Correct Answer: 27

Explanation:


Introduction / Context:
Many number series use alternating operations. Recognizing the repeating pattern (multiply by a constant, then divide by a constant) allows quick continuation of the sequence.



Given Data / Assumptions:

  • Given terms: 8, 24, 12, 36, 18, 54, (…)
  • We suspect an alternating rule between consecutive terms.


Concept / Approach:
Compare each transition: 8 to 24 appears as ×3, then 24 to 12 as ÷2. If this alternates, the pattern is ×3, ÷2, ×3, ÷2, and so on.



Step-by-Step Solution:

8 × 3 = 24.24 ÷ 2 = 12.12 × 3 = 36.36 ÷ 2 = 18.18 × 3 = 54.Next operation should be ÷2: 54 ÷ 2 = 27.


Verification / Alternative check:
Continue one more step mentally to ensure consistency: after 27, the next would be ×3 → 81, reinforcing the alternating structure.



Why Other Options Are Wrong:

  • 108 and 72: These would match a ×2 or ×4 step, which breaks the ÷2 requirement at this position.
  • 68: Does not match any simple consistent factor with the pattern.


Common Pitfalls:
Applying the wrong operation order (e.g., dividing when multiplication is due). Always map the full alternating pattern before computing the next term.



Final Answer:
27

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