Discussion
One term of this sequence has been replaced by a question mark. Discover the pattern and state the value the question mark conceals.
4, 8, 19, 38, 49, ?
Answer: B
Correct answer: 98
The steps run 4, 11, 19, 11, 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 49 gives 98. As a check, the step from 49 to the answer is 49, which breaks the run of preceding gaps exactly as an alternating rule demands. Reading the series aloud sometimes reveals a rhythm that the written form conceals.
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