Problem 130 of 7
Classify the sequence 1, 2, 4, 7 as arithmetic, geometric, both, or neither.
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test differences and ratios.
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Terms must allow testing differences and ratios.
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Solution
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1. Check consecutive differences for arithmetic.
2. Check consecutive ratios for geometric.
3. Use all given terms before classifying.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Classification based on first two terms only when later terms contradict it.