Difficulty: Easy
Correct Answer: 27
Explanation:
Given data
Sequence: 1, 2, 3, 6, 9, 18, ?, 54
Concept/Approach
The pattern alternates: multiply by 2, then by 1.5 (i.e., 3/2).
Step-by-step
1 × 2 = 22 × 1.5 = 33 × 2 = 66 × 1.5 = 99 × 2 = 1818 × 1.5 = 2727 × 2 = 54 (checks next term)
Final Answer
27
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