Discussion
The numbers below advance according to a pattern you are asked to identify. Determine the relationship and select the number that follows.
1, 4, 5, 9, 14, 23, ?
Answer: A
Correct answer: 37
Each term is the sum of the two before it. Testing this in the middle of the series, 1 plus 4 is 5, and 4 plus 5 is 9. Applying it to the last pair, 14 plus 23 is 37. As a check, subtracting 23 from the answer leaves 14, which is the term two places back, exactly as the rule requires. Testing the rule on the earliest pair guards against a rule invented to fit only the end of the series.
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