Discussion
A consistent rule produced every one of the numbers below. Determine the relationship and select the number that follows.
3, 7, 10, 17, 27, ?
Answer: B
Correct answer: 44
Each term is the sum of the two before it. Testing this in the middle of the series, 3 plus 7 is 10, and 7 plus 10 is 17. Applying it to the last pair, 17 plus 27 is 44. As a check, subtracting 27 from the answer leaves 17, which is the term two places back, exactly as the rule requires. Recognising squares and cubes on sight saves more time in this topic than any other single piece of preparation.
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