Discussion
The numbers below were generated by a rule that holds throughout. Identify the pattern, then choose the number that belongs at the question mark.
5, 8, 13, 21, 34, ?
Answer: A
Correct answer: 55
Each term is the sum of the two before it. Testing this in the middle of the series, 5 plus 8 is 13, and 8 plus 13 is 21. Applying it to the last pair, 21 plus 34 is 55. As a check, subtracting 34 from the answer leaves 21, which is the term two places back, exactly as the rule requires. Adding the last two terms is a single operation, so the main risk is reading the wrong pair rather than the arithmetic itself.
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