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Asked in Premeth Test 18 — Alkyl Halides, Aldehydes and Ketones, Atomic Structure (20 March 2025) 2025

Look at this series: 12, 11, 13, 12, 14, 13, ... What number should come next?

Correct answer: D. 15

  • A. 10
  • B. 12
  • C. 13
  • D. 15

Explanation

The sequence alternates between subtracting 1 and adding 2:Start with 12Subtract 1 to get 11Add 2 to get 13Subtract 1 to get 12Add 2 to get 14Subtract 1 to get 13Add 2 to get 15The next number is 15, following the established pattern of alternating operations. The incorrect options fail to maintain this pattern, either by miscalculating the operations or by failing to consider the alternation entirely.

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Series questions use numbers, letters, symbols or combinations arranged according to a hidden pattern. You may need to identify repeated operations, alternating rules, alphabetical positions, differences, reversals and mixed sequences to find a missing term or predict the next one.

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