Discussion
The list below is incomplete by exactly one term. Establish what governs the terms and give the one that comes next.
4, 12, 18, 54, 60, ?
Answer: C
Correct answer: 180
The steps run 8, 6, 36, 6, which grow and then fall back, so a single operation cannot account for them. Two operations are applied in turn, and continuing the alternation from 60 gives 180. As a check, the step from 60 to the answer is 120, which breaks the run of preceding gaps exactly as an alternating rule demands. The distractor formed by applying the wrong operation is always among the options in questions of this shape.
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