Discussion
The run of numbers below stops one term short of where it should. Determine the relationship and select the number that follows.
1, 5, 6, 11, 17, 28, ?
Answer: A
Correct answer: 45
Each term is the sum of the two before it. Testing this in the middle of the series, 1 plus 5 is 6, and 5 plus 6 is 11. Applying it to the last pair, 17 plus 28 is 45. As a check, subtracting 28 from the answer leaves 17, which is the term two places back, exactly as the rule requires. The size of the jump between the last two terms sets a rough expectation for the answer, which filters the options.
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