Discussion
The numbers below are not random; a rule accounts for all of them. Determine the relationship and select the number that follows.
11, 22, 33, 44, ?
Answer: A
Correct answer: 55
The gaps are 11, 11, 11, which follow no constant pattern, so the rule lies in the terms rather than in the steps between them. Each term is eleven times its position: position 1 gives 11 and position 4 gives 44. The next position is 5, which gives 55. As a check, the same rule applied to the earlier positions reproduces 11, 22, 33, 44 exactly, so it accounts for every term shown and not merely the last. A linear rule in the position number produces a constant difference, so the two descriptions are the same thing seen differently.
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