Discussion
The list below is incomplete by exactly one term. Discover the pattern and state the value the question mark conceals.
7, 14, 17, 34, 37, 74, ?
Answer: C
Correct answer: 77
The steps run 7, 3, 17, 3, 37, 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 74 gives 77. As a check, the step from 74 to the answer is 3, which breaks the run of preceding gaps exactly as an alternating rule demands. An additive series can be extended indefinitely, so the number of terms shown carries no information about the rule.
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