Discussion
This run continues in a way the terms shown are enough to determine. Discover the pattern and state the value the question mark conceals.
3, 12, 17, 68, 73, ?
Answer: B
Correct answer: 292
The steps run 9, 5, 51, 5, 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 73 gives 292. As a check, the step from 73 to the answer is 219, which breaks the run of preceding gaps exactly as an alternating rule demands. Multiplicative series reach large numbers within five or six terms, which is why they are shown with fewer terms.
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