Discussion
Each of the terms below stands in a fixed relation to its neighbours. Determine the relationship and select the number that follows.
6, 7, 13, 20, 33, ?
Answer: D
Correct answer: 53
Each term is the sum of the two before it. Testing this in the middle of the series, 6 plus 7 is 13, and 7 plus 13 is 20. Applying it to the last pair, 20 plus 33 is 53. As a check, subtracting 33 from the answer leaves 20, which is the term two places back, exactly as the rule requires. Where a series involves both a multiplication and an addition, the multiplication is usually applied first.
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