NIMCET 2013
Find the missing element in the series: A, CD, GHI, ____, UVWXY
Answer (Detailed Solution Below)View answer ▾Hide ▴
Answer: Option B — MNOP
Detailed Solution
Group sizes grow by one letter: 1, 2, 3, 4, 5.
Letters skipped between groups grow too: B (1 letter), E-F (2), J-K-L (3).
The 4-letter group starts at M: MNOP; then Q-R-S-T (4 letters) are skipped to reach UVWXY.
✓ Check
Starting positions A = 1, C = 3, G = 7, M = 13, U = 21 differ by 2, 4, 6, 8.⚠ Common trap
(A) LMNO starts right after K, i.e., skips only two letters after I.Quick tip
Groups start at positions 1, 3, 7, 13, 21 (gaps 2, 4, 6, 8): M = 13, so MNOP
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Series — Preparation
This question tests your understanding of Series, a key topic in the Logical Reasoning section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.
Series questions give a sequence of numbers, letters or a mix of both, and ask you to find the next term, a missing term, or the wrong term. This topic covers number series (based on differences, squares and cubes, multiplication, or mixed operations), letter series, alphanumeric series, and repeating letter patterns. Start by checking the differences between consecutive terms. If those don't show a pattern, check the second differences, ratios, squares and cubes nearby, or whether two separate series alternate. For letter series, convert letters to their alphabet positions and look for the number pattern. With practice, recognising common patterns becomes quick and these questions become reliable marks. Practise the series questions below, each with a step-by-step solution that shows the pattern.