Discussion
This sequence has been cut off before its last term. Identify the pattern, then choose the number that belongs at the question mark.
2, 5, 7, 12, 19, 31, ?
Answer: D
Correct answer: 50
Each term is the sum of the two before it. Testing this in the middle of the series, 2 plus 5 is 7, and 5 plus 7 is 12. Applying it to the last pair, 19 plus 31 is 50. As a check, subtracting 31 from the answer leaves 19, which is the term two places back, exactly as the rule requires. Each term here depends on two predecessors rather than one, which is what distinguishes this family from every other in the topic.
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