Discussion
One term of this sequence has been replaced by a question mark. Determine the relationship and select the number that follows.
4, 5, 9, 14, 23, ?
Answer: B
Correct answer: 37
Each term is the sum of the two before it. Testing this in the middle of the series, 4 plus 5 is 9, and 5 plus 9 is 14. 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. The gap pattern is often clearer when written as a separate row beneath the terms than when held in the head.
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