Discussion
The run of numbers below stops one term short of where it should. Identify the pattern, then choose the number that belongs at the question mark.
2, 3, 5, 8, 13, 21, ?
Answer: A
Correct answer: 34
Each term is the sum of the two before it. Testing this in the middle of the series, 2 plus 3 is 5, and 3 plus 5 is 8. Applying it to the last pair, 13 plus 21 is 34. As a check, subtracting 21 from the answer leaves 13, which is the term two places back, exactly as the rule requires. Adding the two previous terms is a rule that leaves no trace in the differences, so it has to be tested directly on the terms themselves.
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